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Leó Szilárd realizes the concept of the nuclear weapon
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Nazi Germany investigating making nuclear weapons
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The USA being investigating the possibly of making a nuclear weapon
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The Japanese attack Pearl Harbor, the beginning of USA in the war
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The USSR also start researching nuclear bombs
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The Manhattan Project is created and is in charge of making the atomic bomb
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The Japanese also start to think about making an atomic bomb
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Nazi Germany surrenders, the end of World War II in Europe.
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"Little Boy", a gun-type uranium-235 weapon, is dropped on Hiroshima, Japan.
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"Fat Man", a implosion-type plutonium-239 weapon, is dropped on Nagasaki, Japan.
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