1939
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January to May - Many experiments on uranium fission are performed worldwide.
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1941
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January - Based on experiments with a natural uranium reactor, the Germans reject graphite as a moderator.
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1945
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January - First plutonium reprocessing production run at Hanford
January 20 - First U-235 separated at Oak Ridge.
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1950
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January 27 - Fuchs confesses that he gave atomic secrets to the Soviets. More »
January 31 - Truman announces the decision to proceed with the H-bomb. More »
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1954
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January 21 - First nuclear-powered submarine, U.S.S. Nautilus, launched.
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1966
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January 17 - U.S. B-52 bomber crashes near Palomares, Spain with 4 unarmed H-bombs. More »
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1967
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January 27 - Outer Space Treaty bans nuclear weapons being placed in orbit. More »
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2003
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January 10 - North Korea announces it will withdraw from the Nuclear Non-Proliferation Treaty.
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2004
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January 27 - Pakistani investigators have concluded that Abdul Qadeer Khan, considered the father of Pakistan's nuclear bomb -- provided unauthorized technical assistance to Iran's nuclear weapons program in the late 1980s.
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2016
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January 6 - North Korea annouces it had conducted a test of a hydrogen bomb. It is unclear the true nature of nuclear test.
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