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Otto Robert Frisch experimentally confirms Otto Hahn and Fritz Strassman's discovery of nuclear fission
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Albert Einstein writes to President Franklin D. Roosevelt to inform him of efforts in Nazi Germany to purify uranium-235, which could be used to build an atomic bomb.
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after the pearl harbor attacks the US Congress poured money into military research, and above all research on fissile materials.
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the so-called Manhattan project had managed to produce enough plutonium to perform a first nuclear test, code-named “Trinity”
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Little Boy dropped on the city of Hiroshima in japan. It became the first atomic bomb ever deployed in warfare.
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October 1952 United Kingdom conducts first test of a British nuclear weapon (operation hurricane)
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1972 - Zulfikar Ali Bhutto launched Pakistan's atomic program by making Munir Ahmad Khan as the program head.
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Mordechai Vanunu divulges secrets about the Israeli nuclear weapons program to The Sunday Times in London
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North Korea announces that it has several nuclear explosives
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North Korea tests a nuclear weapon for the first time