Albert Einstein was a pacifist who did not work directly on the atomic bomb. However, he wrote a letter to President Roosevelt in 1939, warning him of the Nazi threat and urging him to develop the bomb. His letter and his equation (E = mc2) helped initiate and facilitate the U.S. effort to build the bomb, which ended World War II. In this video, we will explore how Einstein's letter changed history and what he thought of his role in the nuclear age.

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