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Person

Niels Bohr

A man with gray hair and a beard wearing glasses, a suit, and a tie, seated against a dark background.

Danish physicist (1885–1962) who built the first quantised model of the atom and, from his institute in Copenhagen, shaped the orthodox interpretation of quantum mechanics. Bohr argued that physics is about what we can say about nature, not what nature is, and that complementary descriptions — wave and particle — are both necessary and mutually exclusive. He sparred with Einstein for thirty years over whether the theory was complete.

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