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First Atomic bomb was made at the end of the WW2.
The first a-bomb was dropped on Hiroshima and Nagasaki.

80.000 people were killed in Hiroshima. And 68.000 were injured.

2/3 of the city were destroyed.
Destructive power of bomb was 20.000 tons of TNT.
44% of Nagasaki were destroyed. 35.000 people were killed, 5000 were missing, 60.000 were injured.
After 2 bombs 115.000 people were killed, 9000 were missing, 128.000 were injured. And radioactivity is still present, and it will be in the next 20-50 years.
After war there were experimental explosions on Bikini island, then in Nevada, Eniwetok.
Among the countries possessing Nuclear weapons are:

USA, Russia, Great Britain, France, Canada, India, China.

Among the atomic weapons are: A-bomb, H-bomb, radioactive materials.




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  The first nuclear bomb was detonated on July 16, 1945, at Alamogordo,

New Mexico. The second and third bombs fell on Hiroshima and Nagasaki

in Japan on August 6 and August 9, respectively. They were products of the

"Manhattan Project," the $2 billion wartime effort by U.S. and British

scientists and the U.S. Army to build a weapon that would "end the war."

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At its peak, about 160,000 people worked on the project in more than 25

sites across the United States. No one person can be completely credited

with the invention of nuclear weapons. A few key figures:

In 1933, a Hungarian scientist working in England, Leo Szilard, first

theorized that enormous amounts of energy could be released by a nuclear

"chain reaction."

In December 1938, German scientists Otto Hahn, Fritz Strassmann, Lise Meitner, and Otto Frisch discovered nuclear fission in uranium, the heaviest

natural element. The fissioning produced a tremendous release of energy;

because a very small amount of uranium was involved, no one was


Szilard, who had come to America to conduct chain-reaction research, was

convinced that Hitler would attempt to build an "atomic" bomb. He believed

that the United States ought to do it first. However, Szilard lacked the clout

to get a bomb project going. He and fellow Hungarians working in the

States, Eugene Wigner and Edward Teller, persuaded Albert Einstein, the

world's most famous scientist, to write a letter to President Franklin D.

Roosevelt. Dated August 2, 1939, the letter said that it was conceivable

that "extremely powerful bombs of a new type might be constructed."

Einstein urged the government to help university scientists with their research

into chain reactions. He also implied that Germany might be working on

chain reactions.

In June 1942, the army took over the task of organizing all chain-reaction

research into a full-blown bomb program, code-named the Manhattan

Engineer District. Gen. Leslie R. Groves, the man who had just built the

Pentagon, was in charge of the top-secret project.

Enrico Fermi, a Nobel Prize-winning emigre from Italy, presided over the

first self-sustaining manmade nuclear chain reaction, which took place

December 2, 1942, at the University of Chicago. University of California

physicist Robert Oppenheimer became scientific director of Los Alamos

National Laboratory.

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