1938
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December - Enrico Fermi receives the Nobel prize for the discovery of transuranic elements (actually fission of uranium) and departs for the "new world." More »
December 22, Hahn and Strassmann (later Meiter and Frisch) conclude that the identification of barium implies that the uranium nucleus has been fissioned by neutrons. More »
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1941
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December 6 - The Manhattan Project Begins. More »
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1942
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December 2 - First nuclear chain reaction at Chicago's Stagg Field by Enrico Fermi. More »
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1946
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December 31 - Atomic Energy Commission (AEC) takes over nuclear weapons program from the U.S. Army. More »
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1953
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December 8 - President Eisenhower proposes "Atoms for Peace". More »
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1979
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December 26 - U.S.S.R. invades Afghanistan; SALT II Treaty removed from consideration by the Senate. More »
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1986
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December - First 10 MX/Peacekeepers missiles become operational. More »
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1987
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December 8 - Reagan and Gorbachev sign the INF Treaty. More »
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2001
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December 13 - U.S. withdraws from the Anti-Ballistic Missile Treaty. More »
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2003
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December 19 - Libya gives up it nuclear weapons program.
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2010
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December 22 - The United States' Senate Approves of New START. More »
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