n 1920 Arthur Eddington, an English astrophysicist, gave a lecture to the British Association for the Advancement of Science on the internal structure of stars. In it, he hypothesised that what makes the sun shine—then a matter of much debate—was some sort of nuclear reaction. “This reservoir”, he said, “can scarcely be other than the subatomic energy which, it is known, exists abundantly in all matter; we sometimes dream that man will one day learn how to release it and use it for his service.
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