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Szilard went on to make monumental strides in nuclear physics. His groundbreaking idea of a nuclear chain reaction created the theoretical groundwork for atomic bomb development. His collaboration with fellow Hungarian physicists eventually led to Albert Einstein's famous letter to President Roosevelt, urging the U.S. to initiate its atomic weapons program. This letter catalyzed what would become the Manhattan Project, underscoring the crucial Hungarian contributions that would forever alter the landscape of science and warfare.