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On September 12, 1933, it occurred to Leo Szilard how a nuclear chain reaction would work.
https://en.wikipedia.org/wiki/September_12• 1933 – Leó Szilárd, waiting for a red light on Southampton Row in Bloomsbury, conceives the idea of the nuclear chain reaction.
Wed Sep 13, 2023: On September 12, 1933, it occurred to Leo Szilard how a nuclear chain reaction would work.