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Richard Feynman

A man with gray hair and a mustache wearing a brown suit jacket, light blue shirt, and patterned tie stands against a dark background.

American physicist (1918–1988) who reformulated quantum mechanics as a sum over all possible paths, won the Nobel Prize for quantum electrodynamics, and worked on the Manhattan Project. His three-volume Lectures on Physics opens its treatment of quantum mechanics with the double-slit experiment, which he called the only mystery — a phenomenon that contains all the strangeness of the theory in concentrated form, and which cannot be explained classically.

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