Albert Einstein (14 March 187918 April 1955) was a German-born<!-- Please do not change this—see talk page and its many archives.--> theoretical physicist who is best known for developing the theory of relativity. Einstein also made important contributions to quantum mechanics. His mass–energy equivalence formula , which arises from special relativity, has been called "the world's most famous equation". He received the 1921 Nobel Prize in Physics for . Wikipedia
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