Friday, April 8, 2011

Descovery of Electrons


J.J. Thomson became the third Cavendish Professor of Experimental Physics in 1884. One of the phenomena he studied was the conduction of electricity through gases.

One subject which interested Thomson was cathode rays. These rays are emitted at the cathode, or negative terminal, in a discharge tube. In 1879 Crookes had proposed that the cathode rays were 'radiant matter', negatively charged particles that were repelled from the negatively charged cathode and attracted to the positively charged anode.

The nature of the cathode rays was controversial. Although Thomson thought the rays must be particles, many Europeans thought they were an 'etherial disturbance', like light. In Germany Hertz had observed the rays passing through thin sheets of gold. It seemed impossible that particles could pass through solid matter.

Hertz had also found (wrongly) that the rays were not deflected by electric fields. In 1897 Thomson repeated Hertz's experiment.J.J. Thomson had balanced the cathode rays between the electric and magnetic forces.

The force (F) on a charged object in an electric field depends on the strength of the electric field (E), multipled by the charge (q) on the object.

F = Eq

The force (F) on a charged object in a magnetic field depends on the strength of the magnetic field (B), multipled by both the charge (q) and velocity (v) of the object.

F = Bqv

Since the forces were balanced:

Eq = Bqv

v = E/B

The velocity was equal to the electric field strength divided by the magnetic field strength. Thomson could measure these field strengths and use them to calculate the velocity of the rays.

Thursday, April 7, 2011

Technical Education

Lincoln College of New England takes a unique approach to education. The college prides itself on helping students achieve more than just a degree... We provide an education that focuses on big results - results that help build a successful and fulfilling future while emphasizing the importance of lifelong learning. Our goal is to help each Lincoln College of New England student Be Amazing in all that they do.

Lincoln College of New England graduates have an excellent reputation among employers and are poised for success. On-campus housing is available at our three distinct small, campuses in Hartford, Southington and Suffield, CT.

Lincoln College of New England offers more than 30 undergraduate degree programs within the fields of Health Sciences, Business, Communications, Hospitality, and more. Bachelor Degrees, Associate Degrees, and Certificates are available depending on program area.

Nepal rich in hydropower

Nepal's most possessed natural resource is water. A land-locked country it may be, but the country is blessed by snow-capped mountains which feed Nepal land. Rivers are not only for rafters but also for businessmen. More than 80% of Nepal's electricity is generated by rivers. Snow-capped Himalayas are the main sources of Nepali rivers. Nepal has altitude ranging from 60 meter to all the way upto 8848 meters (Mt everest), the highest altitude of the earth. Some of the fastest running rivers in the world are located here.

There are three major rivers in Nepal namely Kosi River, Gandaki River and Karnali River which lie across east to west running from north to south. Surroundings of most rivers are in their natural settings. Nepali rivers are paradise to River Rafters who just can't have enough of angry and mad rivers. Need we mention Himalayan Water? It's all here in this beautiful country. No matter how many rivers you have rafted here, there is always a river waiting to be explored.Many of Nepal's rivers such as the Karnali, Seti, and Gandaki are fueled by the Himalayas. These rivers rush through 8848m altitude from sea level to 60m. Extreme elevation of the land helps these rivers fly! And they carry water to generate more than 90,000 mW of electricity. Currently Nepal produces less than 2% of it's capacity. So why hasn't anything been done to get closer to 98% of this open business ?
Many small sized hydro power plants are being currently setup. Lack of infrastructure such as roads, government policy, war and conflict in the region has slowed down many projects.

In Nepal, there are more plans than actions. There are plans to elevate poverty, such plans go through numbers like these.. Plan 1 to Plan 20. There are also plans to setup hydro-power projects to make nepal sufficient of electricity and also earn foreign revenue by selling it. Hydro power Plans have similar numbers like Plan 1 and Plan 2 and so on. They are as boring as the talks of political leaders. Everybody loves pointing their fingers at the other Government, and Every Government operates for about an year before it is replaced by another. When the new Government comes to office, they argue why plan-numbers were not long, so they add Plan 21 through Plan 9999 before saying good bye! In last 10 years alone, Nepal had more than 10 different governments, about one new government per year.

In case you were interested, there are hydro-power plans for upto year 2030, by which they believe Nepal will produce enough electricity for the entire country as well as start making some money by selling it!



Many small to medium sized, some privately owned hydropower plants are being setup in many part of the country, proving to all foreign investors that Nepal's rivers are good for business. Read about Nepal's War and how Nepal is unfolding, some argue is it really ? Also visit blogs by Nepalese who have good coverage on what Nepali Government really is. See Web Directory > Nepali Blogs

Also check out this nice PDF File which has Nepal Power Development Map, lot of small to large scale hydro power projects, some active and some just sleeping ones

Einstien photoelectric effect



In the photoelectric effect, electrons are emitted from matter (metals and non-metallic solids, liquids or gases) as a consequence of their absorption of energy from electromagnetic radiation of very short wavelength, such as visible or ultraviolet light. Electrons emitted in this manner may be referred to as "photoelectrons".First observed by Heinrich Hertz in 1887, the phenomenon is also known as the "Hertz effect", although the latter term has fallen out of general use. Hertz observed and then showed that electrodes illuminated with ultraviolet light create electric sparks more easily.

The photoelectric effect requires photons with energies from a few electronvolts to over 1 MeV in high atomic number elements. Study of the photoelectric effect led to important steps in understanding the quantum nature of light and electrons and influenced the formation of the concept of wave–particle duality. Other phenomena where light affects the movement of electric charges include the photoconductive effect (also known as photoconductivity or photoresistivity), the photovoltaic effect, and the photoelectrochemical effect.

The photons of a light beam have a characteristic energy determined by the frequency of the light. In the photoemission process, if an electron within some material absorbs the energy of one photon and thus has more energy than the work function (the electron binding energy) of the material, it is ejected. If the photon energy is too low, the electron is unable to escape the material. Increasing the intensity of the light beam increases the number of photons in the light beam, and thus increases the number of electrons excited, but does not increase the energy that each electron possesses. The energy of the emitted electrons does not depend on the intensity of the incoming light, but only on the energy or frequency of the individual photons. It is an interaction between the incident photon and the outermost electron.

Electrons can absorb energy from photons when irradiated, but they usually follow an "all or nothing" principle. All of the energy from one photon must be absorbed and used to liberate one electron from atomic binding, or else the energy is re-emitted. If the photon energy is absorbed, some of the energy liberates the electron from the atom, and the rest contributes to the electron's kinetic energy as a free particle.[citation needed]
Experimental results of the photoelectric emission
For a given metal and frequency of incident radiation, the rate at which photoelectrons are ejected is directly proportional to the intensity of the incident light.
For a given metal, there exists a certain minimum frequency of incident radiation below which no photoelectrons can be emitted. This frequency is called the threshold frequency.
For a given metal of particular work function, increase in intensity of incident beam increases the magnitude of the photoelectric current, though stoppage voltage remains the same.
For a given metal of particular work function, increase in frequency of incident beam increases the maximum kinetic energy with which the photoelectrons are emitted, but the photoelectric current remains the same, though stoppage voltage increases.
Above the threshold frequency, the maximum kinetic energy of the emitted photoelectron depends on the frequency of the incident light, but is independent of the intensity of the incident light so long as the latter is not too high [5]
The time lag between the incidence of radiation and the emission of a photoelectron is very small, less than 10−9 second.
The direction of distribution of emitted electrons peaks in the direction of polarization (the direction of the electric field) of the incident light, if it is linearly polarized.[citation needed]
Mathematical description

The maximum kinetic energy Kmax of an ejected electron is given by


where h is the Planck constant, f is the frequency of the incident photon, and φ = hf0 is the work function (sometimes denoted W), which is the minimum energy required to remove a delocalised electron from the surface of any given metal. The work function, in turn, can be written as


where f0 is called the threshold frequency for the metal. The maximum kinetic energy of an ejected electron is


Because the kinetic energy of the electron must be positive, it follows that the frequency f of the incident photon must be greater than f0 in order for the photoelectric effect to occur
Stopping potential

The relation between current through an illuminated photoelectric system and applied voltage illustrates the nature of the photoelectric effect. For discussion, a plate P is illuminated by a light source, and any emitted electrons are collected at another plate electrode Q. The potential between P and Q can be varied and the current flowing in the external circuit between P and Q is measured.

If the frequency and the intensity of the incident radiation are kept fixed, it is found that the photoelectric current increases gradually with the increase in positive potential until all the photoelectrons emitted are collected. The photoelectric current attains saturation value and it does not increase further for any increase in the positive potential. The saturation current depends on the intensity of illumination, but not its wavelength.

If we apply negative potential to plate Q with respect to plate P, and increases it gradually we note that photoelectric current decreases rapidly until it is zero, at a certain negative potential on plate Q.The minimum negative potential given to plate Q at which the photoelectric current becomes zero is called stopping potential or cut off potential.[7] i. For the given frequency of incident radiation, the stopping potential is independent of its intensity.

ii. For a given frequency of the incident radiation, the stopping potential V0 if related to the maximum kinetic energy of the photoelectron that is just stopped from reaching plate Q.

If m is the mass and vmax is the maximum velocity of photoelectron emitted, then



If e is the charge on the electron and V0is the stopping potential, then work done by the retarding potential in stopping the electron = eV0.

Therefore, we have, 1/2mv2max = eV0

The above relation shows that the maximum velocity of the emitted photoelectron is independent of the intensity of the incident light.

Hence, we have the next equality:
Kmax = eV0

The stopping voltage varies linearly with frequency of light, but depends on the type of material. For any particular material, there is a threshold frequency that must be exceeded, independent of light intensity, to observe any electron emission.
Three-step model

In the X-ray regime, the photoelectric effect in crystalline material is often decomposed into three steps:[8]
Inner photoelectric effect (see photodiode below). The hole left behind can give rise to auger effect, which is visible even when the electron does not leave the material. In molecular solids phonons are excited in this step and may be visible as lines in the final electron energy. The inner photoeffect has to be dipole allowed. The transition rules for atoms translate via the tight-binding model onto the crystal. They are similar in geometry to plasma oscillations in that they have to be transversal.
Ballistic transport of half of the electrons to the surface. Some electrons are scattered.
Electrons escape from the material at the surface.

In the three-step model, an electron can take multiple paths through these three steps. All paths can interfere in the sense of the path integral formulation. For surface states and molecules the three-step model does still make some sense as even most atoms have multiple electrons which can scatter the one electron leaving.[citation needed]

Wednesday, April 6, 2011

Hurricane(Destruction)


Hurricane Katrina of the 2005 Atlantic hurricane season was the costliest natural disaster, as well as one of the five deadliest hurricanes, in the history of the United States.[2] Among recorded Atlantic hurricanes, it was the sixth strongest overall. At least 1,836 people died in the actual hurricane and in the subsequent floods, making it the deadliest U.S. hurricane since the 1928 Okeechobee hurricane; total property damage was estimated at $81 billion (2005 USD) nearly triple the damage wrought by Hurricane Andrew in 1992.

Hurricane Katrina formed over the Bahamas on August 23, 2005 and crossed southern Florida as a moderate Category 1 hurricane, causing some deaths and flooding there before strengthening rapidly in the Gulf of Mexico. The storm weakened before making its second landfall as a Category storm on the morning of Monday, August 29 in southeast Louisiana. It caused severe destruction along the Gulf coast from central Florida to Texas, much of it due to the storm surge. The most significant amount of deaths occurred in New Orleans, Louisiana, which flooded as the levee system catastrophically failed, in many cases hours after the storm had moved inland. Eventually 80% of the city and large tracts of neighboring parishes became flooded, and the floodwaters lingered for weeks. However, the worst property damage occurred in coastal areas, such as all Mississippi beachfront towns, which were flooded over 90% in hours, as boats and casino barges rammed buildings, pushing cars and houses inland, with waters reaching 6–12 miles (10–19 km) from the beach.

The hurricane protection failures in New Orleans prompted a lawsuit against the US Army Corps of Engineers (USACE), the designers and builders of the levee system as mandated in the Flood Control Act of 1965. Responsibility for the failures and flooding was laid squarely on the Army Corps in January 2008, but the federal agency could not be held financially liable due to sovereign immunity in the Flood Control Act of 1928. There was also an investigation of the responses from federal, state and local governments, resulting in the resignation of Federal Emergency Management Agency (FEMA) director Michael D. Brown, and of New Orleans Police Department (NOPD) Superintendent Eddie Compass. Conversely, the United States Coast Guard (USCG), National Hurricane Center (NHC) and National Weather Service (NWS) were widely commended for their actions, accurate forecasts and abundant lead time.

Five years later, thousands of displaced residents in Mississippi and Louisiana are still living in temporary accommodation. Reconstruction of each section of the southern portion of Louisiana has been addressed in the Army Corps of Engineers LACPR Final Technical Report which identifies areas not to be rebuilt and areas and buildings that need to be elevated.

Black hole


A black hole is a region of space from which nothing, not even light, can escape. The theory of general relativity predicts that a sufficiently compact mass will deform spacetime to form a black hole. Around a black hole there is an undetectable surface called an event horizon that marks the point of no return. It is called "black" because it absorbs all the light that hits the horizon, reflecting nothing, just like a perfect black body in thermodynamics.[1] Quantum mechanics predicts that black holes emit radiation like a black body with a finite temperature. This temperature is inversely proportional to the mass of the black hole, making it difficult to observe this radiation for black holes of stellar mass or greater.

Objects whose gravity field is too strong for light to escape were first considered in the 18th century by John Michell and Pierre-Simon Laplace. The first modern prediction of a black hole in general relativity was found by Karl Schwarzschild in 1916, although its interpretation as a black hole was not fully appreciated for another four decades. Long considered a mathematical curiosity, it was during the 1960s that theoretical work showed black holes were a generic prediction of general relativity. The discovery of neutron stars sparked interest in gravitationally collapsed compact objects as a possible astrophysical reality.

Black holes of stellar mass are expected to form when heavy stars collapse in a supernova at the end of their life cycle. After a black hole has formed it can continue to grow by absorbing mass from its surroundings. By absorbing other stars and merging with other black holes, supermassive black holes of millions of solar masses may be formed.

Despite its invisible interior, the presence of a black hole can be inferred through its interaction with other matter. Astronomers have identified numerous stellar black hole candidates in binary systems, by studying their interaction with their companion stars. There is growing consensus that supermassive black holes exist in the centers of most galaxies. In particular, there is strong evidence of a black hole of more than 4 million solar masses at the center of our Milky Way.
In 1915, Albert Einstein developed his theory of general relativity, having earlier shown that gravity does influence light's motion. Only a few months later, Karl Schwarzschild found a solution to Einstein field equations, which describes the gravitational field of a point mass and a spherical mass. A few months after Schwarzschild, Johannes Droste, a student of Hendrik Lorentz, independently gave the same solution for the point mass and wrote more extensively about its properties.[ This solution had a peculiar behaviour at what is now called the Schwarzschild radius, where it became singular, meaning that some of the terms in the Einstein equations became infinite. The nature of this surface was not quite understood at the time. In 1924, Arthur Eddington showed that the singularity disappeared after a change of coordinates (see Eddington–Finkelstein coordinates), although it took until 1933 for Georges Lemaître to realize that this meant the singularity at the Schwarzschild radius was an unphysical coordinate singularity.

In 1931, Subrahmanyan Chandrasekhar calculated, using general relativity, that a non-rotating body of electron-degenerate matter above a certain limiting mass (now called the Chandrasekhar limit at 1.4 solar masses) must have an infinite density. In other words, the object must have a radius of zero. His arguments were opposed by many of his contemporaries like Eddington and Lev Landau, who argued that some yet unknown mechanism would stop the collapse.They were partly correct: a white dwarf slightly more massive than the Chandrasekhar limit will collapse into a neutron star,] which is itself stable because of the Pauli exclusion principle. But in 1939, Robert Oppenheimer and others predicted that neutron stars above approximately three solar masses (the Tolman–Oppenheimer–Volkoff limit) would collapse into black holes for the reasons presented by Chandrasekhar, and concluded that no law of physics was likely to intervene and stop at least some stars from collapsing to black holes.

Oppenheimer and his co-authors interpreted the singularity at the boundary of the Schwarzschild radius as indicating that this was the boundary of a bubble in which time stopped. This is a valid point of view for external observers, but not for infalling observers. Because of this property, the collapsed stars were called "frozen stars,"[13] because an outside observer would see the surface of the star frozen in time at the instant where its collapse takes it inside the Schwarzschild radius.
Golden age
See also: Golden age of general relativity

In 1958, David Finkelstein identified the Schwarzschild surface as an event horizon, "a perfect unidirectional membrane: causal influences can cross it in only one direction" This did not strictly contradict Oppenheimer's results, but extended them to include the point of view of infalling observers. Finkelstein's solution extended the Schwarzschild solution for the future of observers falling into a black hole. A complete extension had already been found by Martin Kruskal, who was urged to publish it.

These results came at the beginning of the golden age of general relativity, which was marked by general relativity and black holes becoming mainstream subjects of research. This process was helped by the discovery of pulsars in 1967, which were shown to be rapidly rotating neutron stars by 1969. Until that time, neutron stars, like black holes, were regarded as just theoretical curiosities; but the discovery of pulsars showed their physical relevance and spurred a further interest in all types of compact objects that might be formed by gravitational collapse.

In this period more general black hole solutions were found. In 1963, Roy Kerr found the exact solution for a rotating black hole. Two years later, Ezra Newman found the axisymmetric solution for a black hole that is both rotating and electrically charged. Through the work of Werner Israel Brandon Carter] and David Robinson[23] the no-hair theorem emerged, stating that a stationary black hole solution is completely described by the three parameters of the Kerr–Newman metric; mass, angular momentum, and electric charge.

For a long time, it was suspected that the strange features of the black hole solutions were pathological artefacts from the symmetry conditions imposed, and that the singularities would not appear in generic situations. This view was held in particular by Vladimir Belinsky, Isaak Khalatnikov, and Evgeny Lifshitz, who tried to prove that no singularities appear in generic solutions. However, in the late sixties Roger Penrose[25] and Stephen Hawking used global techniques to prove that singularities are generic.

Work by James Bardeen, Jacob Bekenstein, Carter, and Hawking in the early 1970s led to the formulation of black hole thermodynamics. These laws describe the behaviour of a black hole in close analogy to the laws of thermodynamics by relating mass to energy, area to entropy, and surface gravity to temperature. The analogy was completed when Hawking, in 1974, showed that quantum field theory predicts that black holes should radiate like a black body with a temperature proportional to the surface gravity of the black hole.

The term "black hole" was first publicly used by John Wheeler during a lecture in 1967. Although he is usually credited with coining the phrase, he always insisted that it was suggested to him by somebody else. The first recorded use of the term is in a 1964 letter by Anne Ewing to the American Association for the Advancement of Science. After Wheeler's use of the term, it was quickly adopted in general use.
Properties and structure

The no-hair theorem states that, once it achieves a stable condition after formation, a black hole has only three independent physical properties: mass, charge, and angular momentum.[24] Any two black holes that share the same values for these properties, or parameters, are indistinguishable according to classical (i.e. non-quantum) mechanics.

These properties are special because they are visible from outside a black hole. For example, a charged black hole repels other like charges just like any other charged object. Similarly, the total mass inside a sphere containing a black hole can be found by using the gravitational analog of Gauss's law, the ADM mass, far away from the black hole. Likewise, the angular momentum can be measured from far away using frame dragging by the gravitomagnetic field.

When an object falls into a black hole, any information about the shape of the object or distribution of charge on it is evenly distributed along the horizon of the black hole, and is lost to outside observers. The behavior of the horizon in this situation is closely analogous to that of a conductive stretchy membrane with friction and electrical resistance, a dissipative system (see membrane paradigm).This is different from other field theories like electromagnetism, which do not have any friction or resistivity at the microscopic level, because they are time-reversible. Because a black hole eventually achieves a stable state with only three parameters, there is no way to avoid losing information about the initial conditions: the gravitational and electric fields of a black hole give very little information about what went in. The information that is lost includes every quantity that cannot be measured far away from the black hole horizon, including the total baryon number, lepton number, and all the other nearly conserved pseudo-charges of particle physics. This behavior is so puzzling that it has been called the black hole information loss paradox.

Aomic BOmbing in Hiroshima And Nakasami

During the final stages of World War II in 1945, the United States conducted two atomic bombings against the cities of Hiroshima and Nagasaki in Japan, the first on August 6, 1945 and the second on August 9, 1945. These two events are the only active deployments of nuclear weapons in war to date.

For six months, the United States had made use of intense strategic fire-bombing of 67 Japanese cities. Together with the United Kingdom and the Republic of China, the United States called for a surrender of Japan in the Potsdam Declaration on July 26, 1945. The Japanese government ignored this ultimatum. By executive order of President Harry S. Truman, the U.S. dropped the nuclear weapon "Little Boy" on the city of Hiroshima on Monday, August 6, 1945,[3][4] followed by the detonation of "Fat Man" over Nagasaki on August 9.

Within the first two to four months of the bombings, the acute effects killed 90,000–166,000 people in Hiroshima and 60,000–80,000 in Nagasaki,[1] with roughly half of the deaths in each city occurring on the first day. The Hiroshima prefectural health department estimates that, of the people who died on the day of the explosion, 60% died from flash or flame burns, 30% from falling debris and 10% from other causes. During the following months, large numbers died from the effect of burns, radiation sickness, and other injuries, compounded by illness. In a US estimate of the total immediate and short term cause of death, 15–20% died from radiation sickness, 20–30% from flash burns, and 50–60% from other injuries, compounded by illness. In both cities, most of the dead were civilians.

Six days after the detonation over Nagasaki, on August 15, Japan announced its surrender to the Allied Powers, signing the Instrument of Surrender on September 2, officially ending the Pacific War and therefore World War II. Germany had signed its Instrument of Surrender on May 7, ending the war in Europe. The bombings led, in part, to post-war Japan's adopting Three Non-Nuclear Principles, forbidding the nation from nuclear armament.[9] The role of the bombings in Japan's surrender and the U.S.'s ethical justification for them, as well as their strategical importance, is still debated.

At the time of its bombing, Hiroshima was a city of some industrial and military significance. A number of military camps were located nearby, including the headquarters of the Fifth Division and Field Marshal Shunroku Hata's 2nd General Army Headquarters, which commanded the defense of all of southern Japan.[22] Hiroshima was a minor supply and logistics base for the Japanese military. The city was a communications center, a storage point, and an assembly area for troops. It was one of several Japanese cities left deliberately untouched by American bombing, allowing a pristine environment to measure the damage caused by the atomic bomb.

The center of the city contained several reinforced concrete buildings and lighter structures. Outside the center, the area was congested by a dense collection of small wooden workshops set among Japanese houses. A few larger industrial plants lay near the outskirts of the city. The houses were constructed of wood with tile roofs, and many of the industrial buildings were also built around wood frames. The city as a whole was highly susceptible to fire damage.

The population of Hiroshima had reached a peak of over 381,000 earlier in the war, but prior to the atomic bombing the population had steadily decreased because of a systematic evacuation ordered by the Japanese government. At the time of the attack, the population was approximately 340,000–350,000.[1] Because official documents were burned, the exact population is uncertain.
The bombing

Seizo Yamada's ground level photo taken from approximately 7 km northeast of Hiroshima.
For the composition of the USAAF mission, see 509th Operations Group#Components.

Hiroshima was the primary target of the first nuclear bombing mission on August 6, with Kokura and Nagasaki being alternative targets. August 6 was chosen because clouds had previously obscured the target. The 393d Bombardment Squadron B-29 Enola Gay, piloted and commanded by 509th Composite Group commander Colonel Paul Tibbets, was launched from North Field airbase on Tinian in the West Pacific, about six hours flight time from Japan. The Enola Gay (named after Colonel Tibbets' mother) was accompanied by two other B-29s. The Great Artiste, commanded by Major Charles W. Sweeney, carried instrumentation; and a then-nameless aircraft later called Necessary Evil (the photography aircraft) was commanded by Captain George Marquardt.[

After leaving Tinian the aircraft made their way separately to Iwo Jima where they rendezvoused at 2,440 meters (8,010 ft) and set course for Japan. The aircraft arrived over the target in clear visibility at 9,855 meters (32,333 ft). During the journey, Navy Captain William Parsons had armed the bomb, which had been left unarmed to minimize the risks during takeoff. His assistant, 2nd Lt. Morris Jeppson, removed the safety devices 30 minutes before reaching the target area.

The dark portions of the garments this victim wore during the flash caused burns on their skin.[

About an hour before the bombing, Japanese early warning radar detected the approach of some American aircraft headed for the southern part of Japan. An alert was given and radio broadcasting stopped in many cities, among them Hiroshima. At nearly 08:00, the radar operator in Hiroshima determined that the number of planes coming in was very small—probably not more than three—and the air raid alert was lifted. To conserve fuel and aircraft, the Japanese had decided not to intercept small formations. The normal radio broadcast warning was given to the people that it might be advisable to go to air-raid shelters if B-29s were actually sighted. However a reconnaissance mission was assumed because at 07.31 the first B29 to fly over Hiroshima at 32,000 feet (9,800 m) had been the weather observation aircraft Straight Flush that sent a morse code message to the Enola Gay indicating that the weather was good over the primary target and because it then turned out to sea the 'all clear' was sounded in the city. At 08.09 Colonel Tibbets started his bomb run and handed control over to his bombardier.

The release at 08:15 (Hiroshima time) went as planned, and the gravity bomb known as "Little Boy", a gun-type fission weapon with 60 kilograms (130 lb) of uranium-235, took 43 seconds to fall from the aircraft flying at 31,060 feet (9,470 m)[29] to the predetermined detonation height about 1,900 feet (580 m) above the city. The Enola Gay had traveled 11.5 miles away before it felt the shock waves from the blast.[30]

Due to crosswind, it missed the aiming point, the Aioi Bridge, by almost 800 feet (240 m) and detonated directly over Shima Surgical Clinic.[31] It created a blast equivalent to about 13 kilotons of TNT (54 TJ). (The U-235 weapon was considered very inefficient, with only 1.38% of its material fissioning.)[32] The radius of total destruction was about one mile (1.6 km), with resulting fires across 4.4 square miles (11 km2).[33] Americans estimated that 4.7 square miles (12 km2) of the city were destroyed. Japanese officials determined that 69% of Hiroshima's buildings were destroyed and another 6–7% damaged.

70,000–80,000 people, or some 30%[35] of the population of Hiroshima were killed immediately, and another 70,000 injured.[36] Over 90% of the doctors and 93% of the nurses in Hiroshima were killed or injured—most had been in the downtown area which received the greatest damage.

Although the U.S. had previously dropped leaflets warning civilians of air raids on 35 Japanese cities, including Hiroshima and Nagasaki,[38] the residents of Hiroshima were given no notice of the atomic bomb.

POSITIVE thinking MAy GOOD for Our Skin

There is power in positive thinking.

Have you noticed that some older adults continue to feel good and stay active well into their senior years, while others appear to age rapidly and experience increased health problems? Positive thinking may play a significant role.

Research published in Psychology and Aging, a journal from the American Psychological Association (APA), shows that while genetics and overall physical health play a part in how people age, positive thinking can also play an important role.

According to an APA news release, researchers found a link between positive emotions and the onset of frailty in 1,558 initially non-frail older Mexican Americans living in five southwestern states. This was the first study to examine frailty and the protective role of positive thinking in the largest minority population in the United States.

How Was the Study Conducted?
Study authors Glenn Ostir, Ph.D., Kenneth Ottenbacher, Ph.D., and Kyriakos Markides, Ph.D., from the University of Texas Medical Branch at Galveston, followed older adults for seven years to study their level of positive thinking in relation to their level of frailty.

Frailty was assessed by measuring:
Weight loss
Exhaustion
Walking speed
Grip strength

The study says that positive emotions (or positive thinking) were measured by asking how often in the past week participants had the following thoughts:
“I felt that I was just as good as other people”
“I felt hopeful about the future”
“I was happy”
“I enjoyed life”

There’s a Link Between Positive Thinking and Frailty
The report said that the incidence of frailty in the older adult participants increased overall nearly eight percent during the seven-year follow-up period, but people who scored high on positive affect or positive thinking were significantly less likely to become frail.

While researchers in the study couldn't explain why positive thinking or positive emotions reduced the incidence of frailty, they speculated that positive thinking may directly affect health via chemical and neural responses that help maintain an overall health balance.

Another possibility, according to the researchers, is that positive thinking can have a beneficial effect on people’s health by increasing a person’s intellectual, physical, psychological and social resources.

You Have a Choice About How You Think
I read somewhere that people can only hold one thought at a time. If that’s true, then you have a choice:
Focusing on a thought that makes you feel bad

or
Focusing on a thought that makes you feel good

Try to focus your energy on positive thinking rather than negative thinking, and look for reasons to feel happy and hopeful every day. If you put your energy toward positive thinking and ways to make your life more enjoyable, you may discover that positive thinking really does help you feel better.

political condition of Nepal

On 1 February 2005 King Gyanendra suspended the Parliament, appointed a government led by himself, and enforced martial law. The King argued that civil politicians were unfit to handle the Maoist insurgency. Telephone lines were cut and several high-profile political leaders were detained. Other opposition leaders fled to India and regrouped there. A broad coalition called the Seven Party Alliance (SPA) was formed in opposition to the royal takeover, encompassing the seven parliamentary parties who held about 90% of the seats in the old, dissolved parliament.

The UN-OHCHR, in response to events in Nepal, set up a monitoring program in 2005 to assess and observe the human rights situation there

On 22 November 2005, the Seven Party Alliance (SPA) of parliamentary parties and the Communist Party of Nepal (Maoist) agreed on a historic and unprecedented 12-point memorandum of understanding (MOU) for peace and democracy. Nepalese from various walks of life and the international community regarded the MOU as an appropriate political response to the crisis that was developing in Nepal. Against the backdrop of the historical sufferings of the Nepalese people and the enormous human cost of the last ten years of violent conflict, the MOU, which proposes a peaceful transition through an elected constituent assembly, created an acceptable formula for a united movement for democracy. As per the 12-point MOU, the SPA called for a protest movement, and the Communist Party of Nepal (Maoist) supported it. This led to a countrywide uprising called the Loktantra Andolan that started in April 2006. All political forces including civil society and professional organizations actively galvanized the people. This resulted in massive and spontaneous demonstrations and rallies held across Nepal against King Gyanendra's autocratic rule.

The people's participation was so broad, momentous and pervasive that the king feared being overthrown.[citation needed] On 21 April 2006, King Gyanendra declared that "power would be returned to the people". This had little effect on the people, who continued to occupy the streets of Kathmandu and other towns, openly defying the daytime curfew. Finally King Gyanendra announced the reinstatement the House of Representatives, thereby conceding one of the major demands of the SPA, at midnight on 24 April 2006. Following this action the coalition of political forces decided to call off the protests.

Twenty-one people died and thousands were injured during the 19 days of protests.[citation needed]

On 19 May 2006, the parliament assumed total legislative power and gave executive power to the Government of Nepal (previously known as His Majesty's Government). Names of many institutions (including the army) were stripped of the "royal" adjective and the Raj Parishad (a council of the King's advisers) was abolished, with his duties assigned to the Parliament itself. The activities of the King became subject to parliamentary scrutiny and the King's properties were subjected to taxation. Moreover, Nepal was declared a secular state abrogating the previous status of a Hindu Kingdom. However, most of the changes have, as yet, not been implemented. On 19 July 2006, the prime minister, G. P. Koirala, sent a letter to the United Nations announcing the intention of the Nepalese government to hold elections to a constituent assembly by April 2007.

facebook history


Mark Zuckerberg wrote Facemash, the predecessor to Facebook, on October 28, 2003, while attending Harvard as a sophomore. According to The Harvard Crimson, the site was comparable to Hot or Not, and "used photos compiled from the online facebooks of nine houses, placing two next to each other at a time and asking users to choose the 'hotter' person".[12][13]

Mark Zuckerberg co-created Facebook in his Harvard dorm room.

To accomplish this, Zuckerberg hacked into the protected areas of Harvard's computer network and copied the houses' private dormitory ID images. Harvard at that time did not have a student "facebook" (a directory with photos and basic information). Facemash attracted 450 visitors and 22,000 photo-views in its first four hours online.[12][14]

The site was quickly forwarded to several campus group list-servers, but was shut down a few days later by the Harvard administration. Zuckerberg was charged by the administration with breach of security, violating copyrights, and violating individual privacy, and faced expulsion. Ultimately, however, the charges were dropped.[15] Zuckerberg expanded on this initial project that semester by creating a social study tool ahead of an art history final, by uploading 500 Augustan images to a website, with one image per page along with a comment section.[14] He opened the site up to his classmates, and people started sharing their notes.

The following semester, Zuckerberg began writing code for a new website in January 2004. He was inspired, he said, by an editorial in The Harvard Crimson about the Facemash incident.[16] On February 4, 2004, Zuckerberg launched "Thefacebook", originally located at thefacebook.com.[17]

Six days after the site launched, three Harvard seniors, Cameron Winklevoss, Tyler Winklevoss, and Divya Narendra, accused Zuckerberg of intentionally misleading them into believing he would help them build a social network called HarvardConnection.com, while he was instead using their ideas to build a competing product.[18] The three complained to the Harvard Crimson, and the newspaper began an investigation. The three later filed a lawsuit against Zuckerberg, subsequently settling.[19]

Membership was initially restricted to students of Harvard College, and within the first month, more than half the undergraduate population at Harvard was registered on the service.[20] Eduardo Saverin (business aspects), Dustin Moskovitz (programmer), Andrew McCollum (graphic artist), and Chris Hughes soon joined Zuckerberg to help promote the website. In March 2004, Facebook expanded to Stanford, Columbia, and Yale.[21] It soon opened to the other Ivy League schools, Boston University, New York University, MIT, and gradually most universities in Canada and the United States.[22][23]

Facebook incorporated in the summer of 2004, and the entrepreneur Sean Parker, who had been informally advising Zuckerberg, became the company's president.[24] In June 2004, Facebook moved its base of operations to Palo Alto, California.[21] It received its first investment later that month from PayPal co-founder Peter Thiel.[25] The company dropped The from its name after purchasing the domain name facebook.com in 2005 for $200,000.[26]
Total active users[N 1]Date Users
(in millions) Days later Monthly growth[N 2]
August 26, 2008 100[27] 1,665 178.38%
April 8, 2009 200[28] 225 13.33%
September 15, 2009 300[29] 150 10%
February 5, 2010 400[30] 143 6.99%
July 21, 2010 500[31] 166 4.52%
January 5, 2011 600[32][N 3] 168 3.57%


Facebook launched a high school version in September 2005, which Zuckerberg called the next logical step.[33] At that time, high-school networks required an invitation to join.[34] Facebook later expanded membership eligibility to employees of several companies, including Apple Inc. and Microsoft.[35] Facebook was then opened on September 26, 2006, to everyone of age 13 and older with a valid email address.[36][37]

On October 24, 2007, Microsoft announced that it had purchased a 1.6% share of Facebook for $240 million, giving Facebook a total implied value of around $15 billion.[38] Microsoft's purchase included rights to place international ads on Facebook.[39] In October 2008, Facebook announced that it would set up its international headquarters in Dublin, Ireland.[40] In September 2009, Facebook said that it had turned cash flow positive for the first time.[41] In November 2010, based on SecondMarket Inc., an exchange for shares of privately held companies, Facebook's value was $41 billion (slightly surpassing eBay's) and it became the third-largest US web company after Google and Amazon.[42] Facebook has been identified as a possible candidate for an IPO by 2013.[43]

Traffic to Facebook increased steadily after 2009. More people visited Facebook than Google for the week ending March 13, 2010.[44] Facebook also became the top social network across eight individual markets—in Australia, the Philippines, Indonesia, Malaysia, Singapore, New Zealand, Hong Kong and Vietnam, while other brands commanded the top positions in certain markets, including Google-owned Orkut in India, Mixi.jp in Japan, CyWorld in South Korea, and Yahoo!'s Wretch.cc in Taiwan.[citation needed]

In March 2011 it was reported that Facebook removes approximately 20,000 profiles from the site every day for various infractions, including spam, inappropriate content and underage use, as part of its efforts to boost cyber security.

HITLERs rise to power


At 6:30 p.m. on the evening of April 20, 1889, he was born in the small Austrian village of Braunau Am Inn just across the border from German Bavaria. Adolf Hitler would one day lead a movement that placed supreme importance on a person's family tree even making it a matter of life and death. However, his own family tree was quite mixed up and would be a lifelong source of embarrassment and concern to him.

His father, Alois, was born in 1837. He was the illegitimate son of Maria Anna Schicklgruber and her unknown mate, which may have been someone from the neighborhood or a poor millworker named Johann Georg Hiedler. It is also remotely possible Adolf Hitler's grandfather was Jewish. Maria Schicklgruber was said to have been employed as a cook in the household of a wealthy Jewish family named Frankenberger. There is some speculation their 19 year old son got her pregnant and regularly sent her money after the birth of Alois. Adolf Hitler would never know for sure just who his grandfather was.

He did know that when his father Alois was about five years old, Maria Schicklgruber married Johann Georg Hiedler. The marriage lasted five years until her death of natural causes, at which time Alois went to live on a small farm with his uncle. At age thirteen, young Alois had enough of farm life and set out for the city of Vienna to make something of himself. He worked as a shoemaker's apprentice then later enlisted in the Austrian civil service, becoming a junior customs official. He worked hard as a civil servant and eventually became a supervisor. By 1875 he achieved the rank of Senior Assistant Inspector, a big accomplishment for the former poor farm boy with little formal education. At this time an event occurred that would have big implications for the future.

Alois had always used the last name of his mother, Schicklgruber, and thus was always called Alois Schicklgruber. He made no attempt to hide the fact he was illegitimate since it was common in rural Austria. But after his success in the civil service, his proud uncle from the small farm convinced him to change his last name to match his own, Hiedler, and continue the family name. However, when it came time to write the name down in the record book it was spelled as Hitler. And so in 1876 at age 39, Alois Schicklgruber became Alois Hitler.

In 1885, after numerous affairs and two other marriages ended, the widowed Alois Hitler, 48, married the pregnant Klara Pölzl, 24, the granddaughter of uncle Hiedler. Technically, because of the name change, she was his own niece and so he had to get special permission from the Catholic church.

The children from his previous marriage, Alois Hitler, Jr. and Angela, attended the wedding and lived with them afterwards. Klara Pölzl eventually gave birth to two boys and a girl, all of whom died. On April 20, 1889, her fourth child, Adolf was born healthy and was baptized a Roman Catholic. Hitler's father was now 52 years old.

Throughout his early days, young Adolf's mother feared losing him as well and lavished much care and affection on him. His father was busy working most of the time and also spent a lot of time on his main hobby, keeping bees. Baby Adolf had the nickname, Adi. When he was almost five, in 1893, his mother gave birth to a brother, Edmund. In 1896 came a sister, Paula.

In May of 1895 at age six, young Adolf Hitler entered first grade in the public school in the village of Fischlham, near Linz Austria.
Hitler's Boyhood
In 1895, at age six, two important events happened in the life of young Adolf Hitler. First, the unrestrained, carefree days he had enjoyed up to now came to an end as he entered primary school. Secondly, his father retired on a pension from the Austrian civil service. This meant a double dose of supervision, discipline and regimentation under the watchful eyes of teachers at school and his strict father at home. His father, now 58, had spent most of his life working his way up through the civil service ranks. He was used to giving orders and having them obeyed and also expected this from his children. The Hitler family lived on a small farm outside of Linz, Austria. The children had farm chores to perform along with their school work.

Hitler's mother was now preoccupied with caring for her new son, Edmund. In 1896 she gave birth to a girl, Paula. The Hitler household now consisted of Adolf, little brother Edmund, little sister Paula, older half brother Alois Jr., older half sister Angela and two parents who were home all the time. It was a crowded, noisy little farm house that seems to have gotten on the nerves on Hitler's father who found retirement after 40 years of work to be difficult.

The oldest boy, Alois Jr., 13, bore the brunt of his father's discontent, including harsh words and occasional beatings. A year later, at age 14, young Alois had enough of this treatment and ran away from home, never to see his father again. This put young Adolf, age 7, next in line for the same treatment.

Also at this time, the family moved off the farm to the town of Lambach, Austria, halfway between Linz and Salzburg. This was the first of several moves the family would make in the restless retirement of Hitler's father. For young Adolf, the move to Lambach meant an end to farm chores and more time to play. There was an old Catholic Benedictine monastery in the town. The ancient monastery was decorated with carved stones and woodwork that included several swastikas. Adolf attended school there and saw them every day. They had been put there in the 1800's by the ruling Abbot as a pun or play on words. His name essentially sounded like the German word for swastika, Hakenkreuz.

Young Hitler did well in the monastery school and also took part in the boys' choir. He was said to have had a fine singing voice. Years later Hitler would say the solemn pageantry of the high mass and other Catholic ceremonies was quite intoxicating and left a very deep impression. As a young boy he idolized the priests and for two years seriously considered becoming a priest himself. He especially admired the Abbot in charge, who ruled his black-robbed monks with supreme authority. At home Hitler sometimes played priest and even included long sermons. At age nine, he got into schoolboy mischief. He was caught smoking a cigarette by one of the priests, but was forgiven and not punished. His favorite game to play outside was cowboys and Indians. Tales of the American West were very popular among boys in Austria and Germany. Books by James Fenimore Cooper and especially German writer Karl May were eagerly read and re-enacted. May, who had never been to America, invented a hero named Old Shatterhand, a white man who always won his battles with Native Americans, defeating his enemies through sheer will power and bravery. Young Hitler read and reread every one of May's books about Old Shatterhand, totaling more than 70 novels. He continued to read them even as Führer. During the German attack on the Soviet Union he sometimes referred to the Russians as Redskins and ordered his officers to carry May's books about fighting Indians.

In describing his boyhood, Hitler later said of himself that he was an argumentative little ring leader who liked to stay outside and hang around with 'husky' boys. His half brother Alois later described him as quick to anger and spoiled by his indulgent mother.

In 1898, the Hitler family moved once again, to the village of Leonding, close to Linz. They settled into a small house with a garden next to a cemetery. This meant another change of schools for Adolf. He found school easy and got good grades with little effort. He also discovered he had considerable talent for drawing, especially sketching buildings. He had the ability to look at a building, memorize the architectural details, and accurately reproduce it on paper, entirely from memory.

One day, young Hitler went rummaging through his father's book collection and came across several of a military nature, including a picture book on the War of 1870-1871 between the Germans and the French. By Hitler's own account, this book became an obsession. He read it over and over, becoming convinced it had been a glorious event.

"It was not long before the great historic struggle had become my greatest spiritual experience. From then on, I became more and more enthusiastic about everything that was in any was connected with war or, for that matter, with soldering." - Hitler stated in his book Mein Kampf.

Cowboys and Indians gave way to battle re-enactments, especially after the Boer War broke out in Africa. Hitler, now eleven years old, took the side of the Boers against the English and never tired of playing war. Sometimes, he even wore out the boys he was playing with and then simply went and found other boys to continue. But now at home, tragedy struck. Adolf's little brother Edmund, age 6, died of measles. Adolf, the boy who loved warplay and its 'pretend' death now had to confront genuine death for the first time. It seems to have shaken him badly.

To make matters worse, the little boy was buried in the cemetery next to their house. From his bedroom window, Adolf could see the cemetery. Years later, neighbors recalled that young Adolf was sometimes seen at night sitting on the wall of the cemetery gazing up at the stars.

And there were now more problems for Adolf. His grade school years were coming to an end and he had to choose which type of secondary school to attend, classical or technical. By now, young Hitler had dreams of one day becoming an artist. He wanted to go to the classical school. But his father wanted him to follow in his footsteps and become a civil servant and sent him to the technical high school in the city of Linz, in September, 1900. Hitler, the country boy, was lost in the city and its big school. City kids also looked down on country kids who went to the school. He was very lonely and extremely unhappy. He did quite poorly his first year, getting kept back.

He would later claim he wanted to show his father he was unsuited for technical education with its emphasis on mathematics and science and thus should have been allowed to become an artist.

"I thought that once my father saw what little progress I was making at the (technical school) he would let me devote myself to the happiness I dreamed of."
-- Hitler explained in Mein Kampf.

There were frequent arguments at home between young Hitler and his father over his career choice. To the traditional minded, authoritarian father, the idea of his son becoming an artist seemed utterly ridiculous. But in the grand scheme of things, as young Adolf saw it, the idea of a career spent sitting in an office all day long doing the boring paper work of a civil servant was utterly horrible. The dream of becoming an artist seemed to be the answer to all his present day problems.

But his stubborn father refused to listen. And so a bitter struggle began between father and son. Hitler began his second year at the high school as the oldest boy in his class since he had been kept back. This gave him the advantage over the other boys. Once again he became a little ringleader and even led the boys in afterschool games of cowboys and Indians, becoming Old Shatterhand. He managed to get better grades in his second year, but still failed mathematics.

Another interest of great importance surfaced at this time, German nationalism. The area of Austria where Hitler grew up is close to the German border. Many Austrians along the border considered themselves to be German-Austrians. Although they were subjects of the Austrian Hapsburg Monarchy and its multicultural empire, they expressed loyalty to the German Imperial House of Hohenzollern and its Kaiser. In defiance of the Austrian Monarchy, Adolf Hitler and his young friends liked to use the German greeting, "Heil," and sing the German anthem "Deutschland Uber Alles," instead of the Austrian Imperial anthem.

Hitler's father had worked as an Austrian Imperial customs agent and continually expressed loyalty to the Hapsburg Monarchy, perhaps unknowingly encouraging his rebellious young son to give his loyalty to the German Kaiser. There was also a history teacher at school, Dr. Leopold Pötsch who touched Hitler's imagination with exciting tales of the glory of German figures such as Bismark and Frederick The Great. For young Hitler, German Nationalism quickly became an obsession.

Adding to all this, was another new interest, the operas of German composer Richard Wagner. Hitler saw his first opera at age twelve and was immediately captivated by its Germanic music, pagan myths, tales of ancient Kings and Knights and their glorious struggles against hated enemies. But now, for young Hitler, the struggle with his father was about to come to a sudden end. In January, 1903, Hitler's father died suddenly of a lung hemorrhage, leaving his thirteen year old son as head of the Hitler household.
Hitler's World War I Service
When World War I was touched off by the assassination by a Serb of the heir to the Austrian Empire, Archduke Franz Ferdinand. Hitler's passions against foreigners, particularly Slavs, were inflamed. He was caught up in the patriotism of the time, and submitted a petition to enlist in the Bavarian army. After less than two months of training, Hitler's regiment saw its first combat near Ypres, against the British and Belgians. Hitler narrowly escaped death in battle several times, and was eventually awarded two Iron Crosses for bravery. He rose to the rank of lance corporal but no further. In October 1916, he was wounded by an enemy shell and evacuated to a Berlin area hospital. After recovering, and serving a total of four years in the trenches, he was temporarily blinded by a mustard gas attack in Belgium in October 1918.

Communist-inspired insurrections shook Germany while Hitler was recovering from his injuries. Some Jews were leaders of these abortive revolutions, and this inspired hatred of Jews as well as Communists. On November 9th, the Kaiser abdicated and the Socialists gained control of the government. Anarchy was more the rule in the cities.
Free Corps
The Free Corps was a paramilitary organization composed of vigilante war veterans who banded together to fight the growing Communist insurgency which was taking over Germany. The Free Corps crushed this insurgency. Its members formed the nucleus of the Nazi "brown-shirts" (S.A.) which served as the Nazi party's army.
Weimar Republic
With the loss of the war, the German monarchy came to an end and a republic was proclaimed. A constitution was written providing for a President with broad political and military power and a parliamentary democracy. A national election was held to elect 423 deputies to the National Assembly. The centrist parties swept to victory. The result was what is known as the Weimar Republic. On June 28, 1919, the German government ratified the Treaty of Versailles. Under the terms of the treaty which ended hostilities in the War, Germany had to pay reparations for all civilian damages caused by the war. Germany also lost her colonies and large portions of German territory. A 30-mile strip on the right bank of the Rhine was demilitarized. Limits were placed on German armaments and military strength. The terms of the treaty were humiliating to most Germans, and condemnation of its terms undermined the government and served as a rallying cry for those who like Hitler believed Germany was ultimately destined for greatness.
German Worker's Party
Soon after the war in Munich, Hitler was recruited to join a military intelligence unit (the Press and Propaganda Department of Group Command IV of the Reichswehr), and was assigned to keep tabs on the German Worker's Party. At the time, it was comprised of only a handful of members. It was disorganized and had no program, but its members expressed a right-wing doctrine consonant with Hitler's.

He saw this party as a vehicle to reach his political ends. His blossoming hatred of the Jews became part of the organization's political platform. Hitler built up the party, converting it from a de facto discussion group to an actual political party. Advertising for the party's meetings appeared in anti-Semitic newspapers. The turning point of Hitler's mesmerizing oratorical career occurred at one such meeting held on October 16, 1919. Hitler's emotional delivery of an impromptu speech captivated his audience. Through word of mouth, donations poured into the party's coffers, and subsequent mass meetings attracted hundreds of Germans eager to hear the young, forceful and hypnotic leader.

As chairman of the NSDAP, he came into contact with Ludendorff, Gottfried Feder (1883-1941), Ernst Röhm (1887-1934), and Dietrich Eckart (1868-1923), whose influence was reflected in Hitler's thought: Gottfried Feder ("Break the bond of interest"), Ernst Röhm (the concept of the "state in arms") and Dietrich Erkart (anti-communism). With the assistance of party staff, Hitler drafted a party program consisting of twenty-five points. This platform was presented at a public meeting on February 24, 1920, with over 2,000 eager participants. After hecklers were forcibly removed by Hitler supporters armed with rubber truncheons and whips, Hitler electrified the audience with his masterful demagoguery. Jews were the principal target of his diatribe. Among the 25 points more negative points were the abrogation of the Versailles Treaty, confiscating war profits, expropriating land without compensation for use by the state, revoking civil rights for Jews, and expelling those Jews who had emigrated into Germany after the war began. More appealing to the masses were no doubt his promotion of the popular welfare ("the common weal comes before individual welfare"), the right of the establishment of self-determination for all Germans and equal rights for their state, and the destruction of the "bondage of interest." The DAP was renamed the National Socialist German Workers' Party. The following day, The Protocols of the Elders of Zion were published in the local anti-Semitic newspaper. The false, but alarming accusations reinforced Hitler's anti-Semitism. Soon after, treatment of the Jews was a major theme of Hitler's orations, and the increasing scape-goating of the Jews for inflation, political instability, unemployment, and the humiliation in the war, found a willing audience. Jews were tied to "internationalism" by Hitler. The name of the party was changed to the National Socialist German Worker's party, and the red flag with the swastika was adopted as the party symbol. A local newspaper which appealed to anti-Semites was on the verge of bankruptcy, and Hitler raised funds to purchase it for the party.

In July 1921 Hitler became chairman of the party (No. 7 on the Executive Committee). In January 1923, French and Belgian troops marched into Germany to settle a reparations dispute. Germans resented this occupation, which also had an adverse effect on the economy. Hitler's party benefitted by the reaction to this development, and exploited it by holding mass protest rallies despite a ban on such rallies by the local police. The Nazi party began drawing thousands of new members, many of whom were victims of hyper-inflation and found comfort in blaming the Jews for this trouble. The price of an egg, for example, had inflated to 30 million times its original price in just 10 years. Economic upheaval generally breeds political upheaval, and Germany in the 1920s was no exception.

The Munich Putsch
The Bavarian government defied the Weimar Republic, accusing it of being too far left. Hitler endorsed the fall of the Weimar Republic, and declared at a public rally on October 30, 1923 that he was prepared to march on Berlin to rid the government of the Communists and the Jews.

On November 8, 1923, Hitler held a rally at a Munich beer hall and proclaimed a revolution. The following day, he led 2,000 armed "brown-shirts" in an attempt to take over the Bavarian government. The small Nazi Party first won national attention in the Beer Hall Putsch of November 1923, when the Ruhr crisis and the great inflation were at their height. Hitler and his Nazis joined with General Erich Ludendorff (1865-1937) and his conservative nationalist followers in an attempt to seize power in Munich. (The plot got its name because it was planned in one of Munich's beer halls.) Once they had taken Munich, Hitler and Ludendorff planned to use the Bavarian capital as a base of operations against the republican government in Berlin. The support that Hitler and Ludendorff expected to receive from some conservative Bavarian politicians failed to materialize, however, and the police easily suppressed the revolt.

Following the collapse of the Beer Hall Putsch, Hitler and Ludendorff were tried for treason. In recognition of his services to Germany during the war, Ludendorff was acquitted. The conservative judges allowed Hitler to use his trial as a propaganda forum for his ideas. Hitler was convicted but sentenced to a term of only five years imprisonment at Landsberg where he would remain only 8 months. During his stay, Hitler put together the first part of his book Mein Kampf.
Hitler's Mein Kampf
Hitler served only eight months of his five-year term. While in prison, he wrote the first volume of Mein Kampf (2ed part was written in 1927-1927). It was partly an autobiographical book (although filled with glorified inaccuracies, self-serving half-truths and outright revisionism) which also detailed his views on the future of the German people. There were several targets of the vicious diatribes in the book, such as democrats, Communists, and internationalists. But he reserved the brunt of his vituperation for the Jews, whom he portrayed as responsible for all of the problems and evils of the world, particularly democracy, Communism, and internationalism, as well as Germany's defeat in the War. Jews were the German nation's true enemy, he wrote. They had no culture of their own, he asserted, but perverted existing cultures such as Germany's with their parasitism. As such, they were not a race, but an anti-race:

"[The Jews'] ultimate goal is the denaturalization, the promiscuous bastardization of other peoples, the lowering of the racial level of the highest peoples as well as the domination of his racial mishmash through the extirpation of the volkish intelligentsia and its replacement by the members of his own people," he wrote. On the contrary, the German people were of the highest racial purity and those destined to be the master race according to Hitler. To maintain that purity, it was necessary to avoid intermarriage with subhuman races such as Jews and Slavs.... Germany could stop the Jews from conquering the world only by eliminating them. By doing so, Germany could also find Lebensraum, living space, without which the superior German culture would decay. This living space, Hitler continued, would come from conquering Russia (which was under the control of Jewish Marxists, he believed) and the Slavic countries. This empire would be launched after democracy was eliminated and a "Führer" called upon to rebuild the German Reich."

A second volume of Mein Kampf was published in 1927. It included a history of the Nazi party to that time and its program, as well as a primer on how to obtain and retain political power, how to use propaganda and terrorism, and how to build a political organization. While Mein Kampf was crudely written and filled with embarrassing tangents and ramblings, it struck a responsive chord among its target and those Germans who believed it was their destiny to dominate Europe. The book sold over five million copies by the start of World War II.
Hitler's Rise to Power
Once released from prison, Hitler decided to seize power constitutionally rather than by force of arms. Using demagogic oratory, Hitler spoke to scores of mass audiences, calling for the German people to resist the yoke of Jews and Communists, and to create a new empire which would rule the world for 1,000 years.
Seeking Electoral Success: 1924-1929
In 1924, Hitler promptly reestablished the NSDAP in Munich. The party was organized according to the Führer principle: it was headed by the Führer, his deputy, and the national leadership with the Reichsleiter heading nation wide departments of the party. The regional political organization descended from the provincial level (Gau), to the county (Kreis), local district (Ortsgruppe), and cell (Zell) to the local bloc (Block). Party organizations, in part para-military, such as the SA (Brownshirt storm troopers), SS (Blackshirt storm troopers), HJ (Hitler Youth), and the BdM (League of German Girls), which were also organized according to the Führer principle, were closely linked to the party, as were the affiliated associations (DAF (German Workers' Front), NSV (National Socialist People's Welfare), and the professional organizations of physicians, teachers, lawyers, civil servants, etc.).
Rise to Power: 1930-1933


The Nazis gradually devised an electoral strategy to win northern farmers and white collar voters in small towns, which produced a landslide electoral victory in September 1930 (jump from roughly 3% to 18% of the votes cast) due to the depression. Refused a chance to form a cabinet, and unwilling to share in a coalition regime, the Nazis joined the Communists in violence and disorder between 1931 and 1933. In 1932, Hitler ran for President and won 30% of the vote, forcing the eventual victor, Paul von Hindenburg, into a runoff election. After a bigger landslide in July 1932 (44%), their vote declined and their movement weakened (Hitler lost the presidential election to WWI veteran Paul von Hindenburg in April; elections of November 1932 roughly 42%), so Hitler decided to enter a coalition government as chancellor in January 1933.

Upon the death of Hindenburg in August 1934, Hitler was the consensus successor. With an improving economy, Hitler claimed credit and consolidated his position as a dictator, having succeeded in eliminating challenges from other political parties and government institutions. The German industrial machine was built up in preparation for war. In November 1937, he was comfortable enough to call his top military aides together at the "Führer Conference," when he outlined his plans for a war of aggression in Europe. Those who objected to the plan were dismissed.

Monday, April 4, 2011

INTELLEGENT

Intelligence is a term describing one or more capacities of the mind. In different contexts this can be defined in different ways, including the capacities for abstract thought, understanding, communication, reasoning, learning, planning, emotional intelligence and problem solving.

Intelligence is most widely studied in humans, but has also been observed in animals and plants. Artificial intelligence is the intelligence of machines or the simulation of intelligence in machines.

Numerous definitions of and hypotheses about intelligence have been proposed since before the twentieth century, with no consensus reached by scholars. Within the discipline of psychology, various approaches to human intelligence have been adopted. The psychometric approach is especially familiar to the general public, as well as being the most researched and by far the most widely used in practical settings.

PEARL HARBOUR

The attack on Pearl Harbor (called Hawaii Operation or Operation AI[6][7] by the Japanese Imperial General Headquarters (Operation Z in planning)[8] and the Battle of Pearl Harbor[who?][9]) was a surprise military strike conducted by the Imperial Japanese Navy against the United States naval base at Pearl Harbor, Hawaii, on the morning of December 7, 1941 (December 8 in Japan). The attack was intended as a preventive action in order to keep the U.S. Pacific Fleet from interfering with military actions the Empire of Japan was planning in Southeast Asia against overseas territories of the United Kingdom, the Netherlands, and the United States.

The base was attacked by 353 Japanese fighters, bombers and torpedo planes in two waves, launched from six aircraft carriers.[10] Four U.S. Navy battleships were sunk (two of which were raised and returned to service later in the war) and the four others present were damaged. The Japanese also sank or damaged three cruisers, three destroyers, an anti-aircraft training ship,[nb 2] and one minelayer. 188 U.S. aircraft were destroyed; 2,402 men were killed[12] and 1,282 wounded. The power station, shipyard, maintenance, and fuel and torpedo storage facilities, as well as the submarine piers and headquarters building (also home of the intelligence section) were not attacked. Japanese losses were light: 29 aircraft and five midget submarines lost, and 65 servicemen killed or wounded. One Japanese sailor was captured.

The attack came as a profound shock to the American people and led directly to the American entry into World War II in both the Pacific and European theaters. The following day (December 8) the United States declared war on Japan. Domestic support for isolationism, which had been strong, disappeared. Clandestine support of Britain (for example the Neutrality Patrol) was replaced by active alliance. Subsequent operations by the U.S. prompted Germany and Italy to declare war on the U.S. on December 11, which was reciprocated by the U.S. the same day.

Despite numerous historical precedents for unannounced military action, the lack of any formal warning by Japan, particularly while negotiations were still apparently ongoing, led President Franklin D. Roosevelt to proclaim December 7, 1941, "a date which will live in infamy".

AMERICA CONTINENT

e Americas, or America,[1][2] (Spanish: América, Portuguese: América, French: Amérique, Quechua: Amirika, Guaraní: Amérika, Aymara: Amërika, Dutch: Amerika)[3] are lands in the Western hemisphere, also known as the New World. In English, the plural form the Americas is often used to refer to the landmasses of North America and South America with their associated islands and regions while the singular form America is primarily used to refer to the United States of America.[2][4][5] The Americas cover 8.3% of the Earth's total surface area (28.4% of its land area) and contain about 13.5% of the human population (about 900 million people).Contents [hide]
1 History
1.1 Settlement
1.2 Pre-Columbian era
1.3 European colonization of the Americas
1.4 Etymology and naming
2 Geology
3 Geography
3.1 Extent
3.2 Topography
3.3 Hydrology
4 Demography
4.1 Population
4.2 Largest urban centers
4.3 Ethnology
4.4 Religion
4.5 Languages
5 Terminology
5.1 America/Americas
5.2 American
5.2.1 English usage
5.2.2 Spanish usage
5.2.3 Portuguese usage
5.2.4 French usage
5.2.5 Dutch usage
5.2.6 Russian usage
6 Countries and territories
6.1 Sovereign states
6.2 Overseas regions, dependencies, colonies
7 Multinational organizations in the Americas
8 See also
9 Footnotes
10 References
11 External links

[edit]
History

CIA political map of the Americas in an equal-area projection
Main article: History of the Americas
[edit]
Settlement
For more details on theories of Paleo-Indian migration, see Models of migration to the New World.

The specifics of Paleo-Indian migration to and throughout the Americas, including the exact dates and routes traveled, are subject to ongoing research and discussion.[6] The traditional theory has been that these early migrants moved into the Beringia land bridge between eastern Siberia and present-day Alaska around 40,000–17,000 years ago,[7] when sea levels were significantly lowered due to the Quaternary glaciation.[6][8] These people are believed to have followed herds of now-extinct pleistocene megafauna along ice-free corridors that stretched between the Laurentide and Cordilleran ice sheets.[9] Another route proposed is that, either on foot or using primitive boats, they migrated down the Pacific Northwest coast to South America.[10] Evidence of the latter would since have been covered by a sea level rise of hundreds of meters following the last ice age.[11]

Archaeologists contend that Paleo-Indians migration out of Beringia (eastern Alaska), ranges somewhere between 40,000 and 16,500 years ago.[12][13][14] The few agreements achieved to date are the origin from Central Asia, with widespread habitation of the Americas during the end of the last glacial period, or more specifically what is known as the late glacial maximum, around 16,000–13,000 years before present.[14][15]

The Inuit migrated into the Arctic section of North America in another wave of migration, arriving around 1000 CE.[16] Around the same time as the Inuit migrated into North America, Viking settlers began arriving in Greenland in 982 and Vinland shortly thereafter, establishing a settlement at L'Anse aux Meadows, near the northernmost tip of Newfoundland.[17] The Viking settlers quickly abandoned Vinland, and disappeared from Greenland by 1500.[18]
[edit]
Pre-Columbian era
Main article: Pre-Columbian era

Mississippian site in Arkansas, Parkin Site, circa 1539. Illustration by Herb Roe.

The pre-Columbian era incorporates all period subdivisions in the history and prehistory of the Americas before the appearance of significant European influences on the American continents, spanning the time of the original settlement in the Upper Paleolithic to European colonization during the Early Modern period.

Pre-Columbian is used especially often in the context of the great indigenous civilizations of the Americas, such as those of Mesoamerica (the Olmec, the Toltec, the Teotihuacano, the Zapotec, the Mixtec, the Aztec, and the Maya) and the Andes (Inca, Moche, Muisca, Cañaris).

Many pre-Columbian civilizations established characteristics and hallmarks which included permanent or urban settlements, agriculture, civic and monumental architecture, and complex societal hierarchies. Some of these civilizations had long faded by the time of the first permanent European arrivals (c. late 15th–early 16th centuries), and are known only through archaeological investigations. Others were contemporary with this period, and are also known from historical accounts of the time. A few, such as the Maya, had their own written records. However, most Europeans of the time viewed such texts as heretical, and much was destroyed in Christian pyres. Only a few hidden documents remain today, leaving modern historians with glimpses of ancient culture and knowledge.[19]

According to both indigenous American and European accounts and documents, American civilizations at the time of European encounter possessed many impressive accomplishments. For instance, the Aztecs built one of the most impressive cities in the world, Tenochtitlan, the ancient site of Mexico City, with an estimated population of 200,000. American civilizations also displayed impressive accomplishments in astronomy and mathematics.[20]
[edit]
European colonization of the Americas
Main article: European colonization of the Americas

Large-scale European colonization of the Americas began shortly after the voyages of Christopher Columbus starting in 1492. The first Spanish settlement on the continent was Panama City on the Pacific coast of Central America founded on August 5, 1519. Panama City was the base for the Spanish conquering of South America. The spread of new diseases brought by Europeans and Africans killed many of the inhabitants of North America and South America,[21][22] with a general population crash of Native Americans occurring in the mid-16th century, often well ahead of European contact.[23] Native peoples and European colonizers came into widespread conflict, resulting in what David Stannard has called a genocide of the indigenous populations.[24] Early European immigrants were often part of state-sponsored attempts to found colonies in the Americas. Migration continued as people moved to the Americas fleeing religious persecution or seeking economic opportunities. Millions of individuals were forcibly transported to the Americas as slaves, prisoners or indentured servants.
[edit]
Etymology and naming

World map of Waldseemüller, which first named America (in the map over Paraguay), Germany, 1507

The earliest known use of the name America for this landmass dates from April 25, 1507, where it was used for what is now known as South America. It first appears on a small globe map with twelve time zones, together with the largest wall map made to date, both created by the German cartographer Martin Waldseemüller in Saint-Dié-des-Vosges in France. These were the first maps to show the Americas as a land mass separate from Asia. An accompanying book, Cosmographiae Introductio, anonymous but apparently written by Waldseemüller's collaborator Matthias Ringmann,[25] states, "I do not see what right any one would have to object to calling this part [that is, the South American mainland], after Americus who discovered it and who is a man of intelligence, Amerigen, that is, the Land of Americus, or America: since both Europa and Asia got their names from women". Americus Vespucius is the Latinized version of the Florentine explorer Amerigo Vespucci's name, and America is the feminine form of Americus. Amerigen is explained as Amerigo plus gen, the accusative case of the Greek word for 'earth', and meaning 'land of Amerigo'.[25] (See etymology.) Amerigo itself is an Italian form of the medieval Latin Emericus (see also Saint Emeric of Hungary), which through the German form Heinrich (in English, Henry) derived from the Germanic name Haimirich.[26]

Vespucci was apparently unaware of the use of his name to refer to the new landmass, as Waldseemüller's maps did not reach Spain until a few years after his death.[25] Ringmann may have been misled into crediting Vespucci by the widely published Soderini Letter, a sensationalized version of one of Vespucci's actual letters reporting on the mapping of the South American coast, which glamorized his discoveries and implied that he had recognized that South America was a continent separate from Asia; in fact, it is not known what Vespucci believed on this count, and he may have died believing what Columbus had, that they had reached the East Indies in Asia rather than a new continent.[27] Spain officially refused to accept the name America for two centuries, saying that Columbus should get credit, and Waldseemüller's later maps, after he had ceased collaboration with Ringmann, did not include it; however, usage was established when Gerardus Mercator applied the name to the entire New World in his 1538 world map. Acceptance may have been aided by the "natural poetic counterpart" that the name America made with Asia, Africa, and Europa.[25]

Map of America by Jonghe, c. 1770
[edit]
Geology

South America broke off from the west of the supercontinent Gondwanaland around 135 million years ago (Ma), forming its own continent.[28] Starting around 15 Ma, the collision of the Caribbean Plate and the Pacific Plate resulted in the emergence of a series of volcanoes along the border that created a number of islands. The gaps in the archipelago of Central America filled in with material eroded off North America and South America, plus new land created by continued volcanism. By 3 Ma, the continents of North America and South America were linked by the Isthmus of Panama, thereby forming the single landmass of the Americas.[29]
[edit]
Geography
Further information: Geography of North America and Geography of South America
[edit]
Extent

The northernmost point of the Americas is Kaffeklubben Island, which is the northernmost point of land on Earth.[30] The southernmost point is the islands of Southern Thule, although they are sometimes considered part of Antarctica.[31] The easternmost point is Nordostrundingen. The westernmost point is Attu Island.

The mainland of the Americas is the longest north-to-south landmass on Earth. At its longest, it stretches roughly 14,000 kilometres, (just under 8700 miles) from the Boothia Peninsula in northern Canada to Cape Froward in Chilean Patagonia. The westernmost point of the mainland of the Americas is the end of the Seward Peninsula in Alaska, while Ponta do Seixas in northeastern Brazil forms the mainland's easternmost extremity.[32]
[edit]
Topography

Aconcagua, the highest mountain in the Americas, located in Argentina

The western geography of the Americas is dominated by the American cordillera, with the Andes running along the west coast of South America[33] and the Rocky Mountains and other Western Cordillera ranges running along the western side of North America.[34] The 2300 km long (1429 mile long) Appalachian Mountains run along the east coast of North America from Alabama to Newfoundland.[35] North of the Appalachians, the Arctic Cordillera runs along the eastern coast of Canada.[36]

Between its coastal mountain ranges, North America has vast flat areas. The Interior Plains spread over much of the continent with low relief.[37] The Canadian Shield covers almost 5 million km² of North America and is generally quite flat.[38] Similarly, the north-east of South America is covered by the flat Amazon Basin.[39] The Brazilian Highlands on the east coast are fairly smooth but show some variations in landform, while further south the Gran Chaco and Pampas are broad lowlands.[40]
[edit]
Hydrology

With coastal mountains and interior plains, the Americas have several large river basins that drain the continents. The largest river basin in South America is that of the Amazon, which has the highest volume flow of any river on Earth.[41] The largest river basin in North America is that of the Mississippi, covering the second largest watershed on the planet.[42] The second largest watershed of South America is that of the Paraná River, which covers about 2.5 million km².[43]
[edit]
Demography
[edit]
Population
Further information: List of sovereign states and dependent territories in the Americas by population
Mexico City, Mexico

New York City, United States

São Paulo, Brazil


The total population of the Americas is about 859,000,000 people and is divided as follows:[citation needed]
North America: 2001 with 495 million and in 2002 with 501 million (includes Central America and the Caribbean)
South America: 2001 with 352 million and in 2002 with 357 million
[edit]
Largest urban centers
See also: Largest cities in the Americas and List of metropolitan areas in the Americas by population

The most populous cities in the Americas are Mexico City, capital of Mexico; New York City, located on the east coast of the United States of America; and São Paulo, capital of the Brazilian state of the same name. Which of these urban centers is considered the most populous depends on the criteria used in determining their populations.City Country Metropolitan Area Rank City Proper Rank
Mexico City Mexico 20,450,000[44] 1st 8,841,916[45] 2nd
New York City United States 19,750,000[44] 2nd 8,363,710[46] 3rd
São Paulo Brazil 18,850,000[44] 3rd 11,244,369[47] 1st

[edit]
Ethnology

The population of the Americas is made up of the descendants of seven large ethnic groups and their combinations.
The Indigenous peoples of the Americas, being Amerindians, Inuit, and Aleuts.
Those of European ancestry, mainly Spanish, British, Irish, Italian, Portuguese, French, Polish, German, Dutch, and Scandinavians.
Mestizos, those of mixed European and Amerindian ancestry.
Those of Black African ancestry, mainly of West African descent.
Mulattoes, people of mixed Black African and European ancestry.
Zambos (Spanish) or Cafusos (Portuguese), those of mixed Black African and Amerindian ancestry.
Asians, that is, those of Eastern, South, and Southeast Asian ancestry.
Those from the Middle East (Middle Easterners).

The majority of the population live in Latin America, named for its predominant cultures whose roots lie in Latin Europe (including the two dominant languages, Spanish and Portuguese, both neolatin), more specifically in the Iberian nations of Portugal and Spain (hence the use of the term Ibero-America as a synonym). Latin America is typically contrasted with Anglo-America (where English, a Germanic language, is prevalent) which comprises Canada (with the exception of francophone Canada rooted in Latin Europe (France): see Québec and Acadia) and the United States. Both are located in North America and present predominantly Anglo-Saxon and Germanic roots.
[edit]
Religion

Sunday, April 3, 2011

hydrogen bomb

It is generally believed that the design and production of hydrogen bombs is difficult, and beyond the reach of some nuclear weapons states, such as North Korea. This is the "Ignorant Peon" view of North Korea. In “Dr. Strangelove,” Air Force Gen. Buck Turgidson disparages the Soviets as “a bunch of ignorant peons” who are unable to “understand a machine like some of our boys.” There is a tendency to disparage the North Koreans (as well as Pakistanis, Iranians and Indians) as ignorant peons whose weapons skills are consistently derided as “primitive.”

This belief is probably incorrect. North Korea’s first two tests were low yield affairs, widely derided as failures, because it did not replicate the multi-kiloton yield of America’s first nuclear test. It did, however, coincide with the sub-kiloton tests of the fission trigger for a hydrogen bomb. The “ignorant peon’” school tells us that North Korea’s “primitive” atomic bombs are too big to put on missiles. But possibly North Korea’s hydrogen bombs are easily fitted on missiles.

Two-stage fusion weapons are probably within the reach of "even the smallest nuclear power", as Doctro Strangelove would phrase it. There are three elements that are needed to build a hydrogen bomb:
The basic design elements of the hydrogen bomb have been a matter of public record for several decades. This desing confounded Edward Teller for the better part of a decade, and Soviet designers needed several years to cover the same ground, but for the past several decades the basic ideas have been well known.
The ingredients of a hydrogen bomb are largely those of an atomic bomb, along with a few other items - Tritium, special plastics, and so forth - that would come fairly readily to hand in a nuclear weapons state.
Computing power is the element that brings together the design and the materials, to simulate the accuracy with which theory has been reduced to practice. Today's home computers are roughly a million times more powerful than the computers used by the United States to produce the first hydrogen bomb.
In all probability, at least one test of a low yield trigger would be needed just to make sure nothing had been overlooked. Israel seems to have conducted once such test in 1979, as did Pakistan in 1998. India conducted multiple low yield tests in 1989, and North Korea has conducted at least two low yield tests.


History

The ultimate success of the United States thermonuclear program rested on five factors. First, was the discovery of a method to overcome the fundamental problem that thermonuclear systems lose as much energy as they create. Second, Los Alamos had to significantly increase the size of its scientific staff. The hydrogen bomb problem required complex interactions among physicists, chemists, and metallurgists. Third, to start a thermonuclear fire, smaller and more efficient fission bombs were needed. Fourth, computational ability had to be greatly enhanced. Fifth, the political decision had to be made to marshal the resources necessary to accomplish the task.

The idea for a hydrogen bomb came from the thermonuclear study of stars conducted in the 1930s by Hans Bethe. Unlike fission weapons, which derive their energy from splitting atoms of the heavy elements uranium and plutonium, hydrogen bombs derive their power from fusing atoms of the light element hydrogen. Since fusion can only be achieved with stellar temperatures, hydrogen bombs were not possible until such a heat source (fission bombs) became available.

By the end of the 1940s, American scientists began to acknowledge the feasibility of a thermonuclear weapon. Though the technical challenges were daunting, few doubted they could be overcome. However, an even more fundamental question arose: even if hydrogen bombs could be built, should they be? A debate ensued, which included world renowned scientists, politicians, civil servants, and eventually the president himself.

Pressure to build it seemed to mount with the discovery that Manhattan Project scientist Klaus Fuchs had passed nuclear secrets-including concepts for a hydrogen bomb-to the Soviets. Fuchs left Los Alamos on June 15, 1946. By January 1949 suspicion of Fuch's involvement in espionage had grown. Fuchs soon confessed to his part in the theft of atomic secrets.

On March 1, 1950, Fuchs was found guilty of communicating information to the Soviets concerning atomic research. But the theoretical work of 1950 had shown that every important point of the 1946 thermonuclear program had been wrong. If the Russians started a thermonuclear program on the basis of the information received from Fuchs, Bethe argued that it must have led to the same failure. Teller later claimed that radiation-implosion -- the key concept behind the successful hydrogen bomb -- had also been discussed at the Los Alamos meeting. Bethe disagreed, and the question remained unresolved.

Indeed, the Russian account of matters gives Fuchs credit for radiation implosion. "In the spring of 1946, another concept, whose paramount importance became evident afterwards, was suggested during work on the `classical Super.' Klaus Fuchs, with the participation of John von Neumann, proposed a new triggering device. It included an additional secondary unit with liquid D± T mixture that would be heated, compressed, and, as a result, ignited by radiation from the primary nuclear bomb. ... Fuchs's configuration was the first physical scheme using radiation implosion and a precursor of Teller ± Ulam's configuration proposed later. Fuchs's proposal, remarkable for its wealth of novel ideas, was well ahead of its time and could not be developed, given the current state of the mathematical modelling of complex physical processes. ... on May 28, 1946, Fuchs and von Neumann filed a joint patent application for the invention of the new design of the triggering system for the `classical Super' using radiation implosion." None of this is attested by American accounts of these matters.

The "Mike" test of Operation Ivy, 1 November, 1952, was the first explosion of a true two-stage thermonuclear device.

Some were convinced that there was another spy still at large in the US weapons program, and that the most likely candidate was Oppenheimer. But the American atmospheric tests of 1954 provided the scientific information necessary for the Soviets to deduce and confirm key features about its design, leading them to develop their own bomb in a short time.

Information about the new powerful explosion conducted by the USA team on March 1, 1954, renewed the drive of Soviet researchers to invent an efficient design of a high-yield thermonuclear bomb. It became clear to the Soviets that there was an efficient design technique, which had been invented by the American team. The only configuration left was a two-stage gadget. A new mechanism for compression of the secondary thermonuclear core by radiation from the primary nuclear charge had been discovered finally. This happened in March and April 1954.
Design Details

The main unknowns to the public are the design of the casing, and the shape and size of the secondary, relative to the primary. Whether the hot plastic does the pushing or transmits its heat to a designated ablator which does the pushing a matter of continuing discussion.

It would seem to be difficult to shape the secondary like a cylinder, and get a compression wave travelling just before fast neutrons from the sparkplug cause fission - although not impossible. Another problem with the cylindrical shape is that compressing from the sides is like squeezing a tube of toothpaste. If the compression is not fast enough, the material will squirt out the ends.

The early secondaries were cylindrical, because the original goal was to make the largest possible multi-megaton explosion with a device whose diameter was more tightly constrained than its length, in order to be dropped from a bomber.

But when the goal became to fit a warhead in the nosecone of the Polaris missile, length and diameter were of comparable dimensions. The Polaris warhead, the W47, which was tested in 1958 and deployed in the 1960s, contained the first spherical secondary, an arrangement which was soon to become the standard design. The advantage of a spherical secondary is higher compression.
Design Physics

The process of combining nuclei (the protons and neutrons inside an atomic nucleus) together with a release of kinetic energy is called fusion. This process powers the Sun, it contributes to the world stockpile of weapons of mass destruction and may one day generate safe, clean electrical power.

This powerful but complex weapon uses the fusion of heavy isotopes of hydrogen, deuterium, and tritium to release large numbers of neutrons when the fusile (sometimes termed "fusionable") material is compressed by the energy released by a fission device called a primary. Fusion (or ‘‘thermonuclear’ weapons derive a significant amount of their total energy from fusion reactions. The intense temperatures and pressures generated by a fission explosion overcome the strong electrical repulsion that would otherwise keep the positively charged nuclei of the fusion fuel from reacting.

The first thermonuclear devices used liquid fuel, such as deuterium, which required significant developments in cryogenics to keep the fuel below its boiling point of –250°C. Later devices used lithium deuteride fuel, in solid form, which breeds tritium when exposed to neutrons.

It is inconvenient to carry deuterium and tritium as gases in a thermonuclear weapon, and certainly impractical to carry them as liquefied gases, which requires high pressures and cryogenic temperatures. Instead, one can make a “dry” device in which 6Li is combined with deuterium to form the compound 6Li D (lithium-6 deuteride). Neutrons from a fission “primary” device bombard the 6 Li in the compound, liberating tritium, which quickly fuses with the nearby deuterium.

The a particles, being electrically charged and at high temperatures, contribute directly to forming the nuclear fireball. The neutrons can bombard additional 6Li nuclei or cause the remaining uranium and plutonium in the weapon to undergo fission. This two-stage thermonuclear weapon has explosive yields far greater than can be achieved with one point safe designs of pure fission weapons, and thermonuclear fusion stages can be ignited in sequence to deliver any desired yield. Such bombs, in theory, can be designed with arbitrarily large yields: the Soviet Union once tested a device with a yield of about 59 megatons.

In a relatively crude sense, 6 Li can be thought of as consisting of an alpha particle ( 4He) and a deuteron ( 2H) bound together. When bombarded by neutrons, 6 Li disintegrates into a triton ( 3 H) and an alpha:

6 Li + Neutron = 3 H + 3 He + Energy.

This is the key to its importance in nuclear weapons physics. The nuclear fusion reaction which ignites most readily is

2 H + 3 H =
4 He + n + 17.6 MeV,

or, phrased in other terms, deuterium plus tritium produces 4He plus a neutron plus 17.6 MeV of free energy:

D + T = 4 He + n + 17.6 MeV.

Lithium-7 also contributes to the production of tritium in a thermonuclear secondary, albeit at a lower rate than 6Li. The fusion reactions derived from tritium produced from 7 Li contributed many unexpected neutrons (and hence far more energy release than planned) to the final stag