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  • October 0, 1957 - Fire breaks out at Britain's Windscale nuclear complex, destroying a reactor core and sending plumes of radioactive material into the atmosphere.
  • October 18, 1999 - The U.S. Senate rejects the Comprehensive Test Ban Treaty (CTBT), drawing widespread international condemnation.
  • October 21, 1994 - The United States and North Korea adopt the "Agreed Framework".
  • October 30, 1961 - The Soviet Union explodes the most powerful bomb ever: a 58 megaton atmospheric nuclear weapons test over Novaya Zemlya off Northern Russia.
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