During the 1930s, the Hungarian physicist Leó Szilárd—who’d met with H. G. Wells in 1929 and tried, without success, to obtain the central European literary rights to his novels—conceived of a nuclear weapon that would explode instantly. A Jewish refugee from Nazi Germany, Szilárd feared that Hitler might launch an atomic bomb program and get the weapon first. Szilárd discussed his concerns with Albert Einstein in the summer of 1939 and helped draft a letter to President Franklin D. Roosevelt. The letter warned that “it may become possible to set up a nuclear chain reaction in a large mass of
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