Nobel Prize-winning physicist Albert Einstein is born in Ulm, Germany. Einstein's work produced the theory of relativity and his quantum theory ushered in the age of modern physics. In 1933 Einstein, a non-practicing Jew, stayed in the United States as Adolf Hitler came to power in Germany, and later became a U.S. citizen. During World War II Einstein advised President Franklin D. Roosevelt about the probability of German research into atomic weaponry.
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