### Possible Answer

The Bethe-Feynman efficiency formula, a simple method for calculating the yield of a fission bomb, was first derived in 1943 after development in 1942. - read more

Bethe–Feynman formula Feynman checkerboard Feynman diagrams ... No Ordinary Genius: The Illustrated Richard Feynman, ed. Christopher Sykes, W. W. Norton & Co, ... - read more

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