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Leó Szilárd (February 11, 1898 - May 30, 1964) was a Hungarian-American physicist and inventor. In 1933, he conceived of the idea of nuclear chain reaction, using recently discovered neutrons. He theorized that if neutrons could initiate any sort of energy-producing nuclear reaction, such as the one that had occurred in lithium, and could be produced themselves by the same reaction, energy might be obtained with little input, since the reaction would be self-sustaining. The following year he filed for a patent on the concept of the neutron-induced nuclear chain reaction. He patented the idea of a nuclear reactor with Enrico Fermi, and in late 1939 wrote the letter for Albert Einstein's signature that resulted in the Manhattan Project that built the atomic bomb. He had an enduring passion for the preservation of human life and political freedom. He hoped that the U.S. government would not use nuclear weapons, but that the mere threat of such weapons would force Germany and Japan to surr...