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Albert Einstein (/ˈaɪnstaɪn/;[4] German: [ˈalbɛɐ̯t ˈʔaɪnʃtaɪn] (About this soundlisten); 14 March 1879 – 18 April 1955) was a German-born theoretical physicist[5] who developed the theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics).[3][6]:274 His work is also known for its influence on the philosophy of science.[7][8] He is best known to the general public for his mass–energy equivalence formula E = mc2, which has been dubbed "the world's most famous equation".[9] He received the 1921 Nobel Prize in Physics "for his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect",[10] a pivotal step in the development of quantum theory.

Albert Einstein Einstein 1921 by F Schmutzer - restoration.jpg Albert Einstein in 1921 Born 14 March 1879 Ulm, Kingdom of Württemberg, German Empire Died 18 April 1955 (aged 76) Princeton, New Jersey, US Residence Germany, Italy, Switzerland, Austria (present-day Czech Republic), Belgium, United States