Word: fallouts
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Dates: during 1990-1999
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...have inadvertently - assisted the Soviets by pushing for an early test blast. The 1952 explosion peppered the atmosphere with a telltale assortment of radioactive debris, including new atomic elements that could have been created only by a compressed fusion reaction. When Hirsch and Mathews asked Bethe if that fallout could have tipped off the Soviets, Bethe instantly said yes. Says Hirsch: "It was as though he had been waiting 35 years for someone to ask him that question...