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John Archibald Wheeler

A man with short, light-colored hair and glasses, wearing a dark blazer over a blue collared shirt, stands against a dark background.

American physicist (1911–2008) who worked on general relativity, nuclear fission, and the foundations of quantum mechanics, and coined the terms black hole, wormhole, and quantum foam. In 1978 he proposed the delayed-choice experiment, in which the decision to measure a quantum system's path is made after it has already passed the relevant junction, dramatising how strange the orthodox interpretation of measurement really is.

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