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  • June 12, 1982 - One million people gather in New York City's Central Park in support of the Second United Nations Special Session on Disarmament. It was the largest anti-war demonstration in history.
  • June 17, 1967 - China conducts its first thermonuclear weapon test.
  • June 28, 1934 - Leo Szilard files for patent amendments for "the liberation of nuclear energy for power production and other purposes through nuclear ’transmutation.’" He proposes a "chain reaction" for the first time.
  • June 30, 1946 - The first subsurface detonation of a nuclear weapon is achieved at Bikini Atoll by the United States.
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