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Heavy Hydrogen or deuterium is discovered by Harold C. Urey.
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The atom is split by John Crockcroft and E.T.S. Walton of Great Britain thereby proving Einstein's Theory of Relativity.
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Robert Oppenheimer realizes the military possibilities of nuclear fission.
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World War II Begins.
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FDR gives the go-ahead for the development of an atomic weapon.
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Colonel Leslie Groves is placed in charge of the Manhattan Project. J. Robert Oppenheimer becomes the Project's Scientific Director.
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Japan becomes the primary target for any future atomic bomb according to the Military Policy Committee of the Manhattan Project.
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Franklin Roosevelt dies. Harry Truman is named the 33rd President of the US.
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The world's first atomic detonation takes place in the 'Trinity Test' at Alamogordo, New Mexico.
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President Truman orders atomic bombs to be used.
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Little Boy, a uranium bomb, is detonated over Hiroshima, Japan. It kills between 90,000 and 100,000 people immediately.
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Fat Man, a plutonium implosion-type bomb, was dropped on the city of Nagasaki
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Japan announces its formal surrender.