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Albert Einstein in middle age, 1920. Born in Ulm, Germany on March 14, 1879, Einstein died at Princeton, US, on April 18, 1955. In 1901, whilst employed at the Patent Office in Berne, he began independent work on problems in physics. In 1905 he published papers on the photoelectric effect (which earned him the 1921 Nobel Prize), the motion of molecules, & most significantly, the special theory of relativity, which includes his famous mass-energy equation. In 1915 an expanded version - The General Theory of Relativity - was published. In 1933, Einstein emigrated to America, to work at Princeton on a theory to unify gravity & electromagnetism.
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