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Heavy water (or deuterium) was being discovered by Harold C. Urey

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Heavy water (or deuterium) was being discovered by Harold C. Urey

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1931

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First nuclear fission has been achieved by Fermi

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First nuclear fission has been achieved by Fermi

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1934

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Einstein writes to President Roosevelt concerning the use of uranium as a new source of energy leading to the formation of the Committee on Uranium.

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Einstein writes to President Roosevelt concerning the use of uranium as a new source of energy leading to the formation of the Committee on Uranium.

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2nd August 1939

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1st September 1939

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Plutonium is being discovered by Glenn Seaborg , Edwin McMillan, Joseph W. Kennedy, and Arthur Wahl

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Plutonium is being discovered by Glenn Seaborg , Edwin McMillan, Joseph W. Kennedy, and Arthur Wahl

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23rd February 1941

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Manhattan Engineering District is established for the purpose of creating an atomic bomb. This would later be called the "Manhattan Project."

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Manhattan Engineering District is established for the purpose of creating an atomic bomb. This would later be called the "Manhattan Project."

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13th August 1942

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First controlled nuclear fission reaction was being produced by Fermi at the University of Chicago.

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First controlled nuclear fission reaction was being produced by Fermi at the University of Chicago.

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2nd December 1942

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The Target Committee of the Manhattan Project selects four cities as possible targets for the atomic bomb: Kyoto, Hiroshima, Kokura, and Niigata.

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The Target Committee of the Manhattan Project selects four cities as possible targets for the atomic bomb: Kyoto, Hiroshima, Kokura, and Niigata.

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27th April 1945

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8th May 1945

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The world's first atomic detonation takes place in the Trinity Test at Alamogordo, New Mexico.

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The world's first atomic detonation takes place in the Trinity Test at Alamogordo, New Mexico.

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16th July 1945

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Little Boy, a uranium bomb, is detonated over Hiroshima, Japan.

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Little Boy, a uranium bomb, is detonated over Hiroshima, Japan.

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6th August 1945

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Fat Man, the second atomic bomb, is detonated over Nagasaki, Japan.

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Fat Man, the second atomic bomb, is detonated over Nagasaki, Japan.

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9th August 1945

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2nd September 1945