One Electron, Threaded Through Time
In the spring of 1940 the telephone rang in the graduate residence at Princeton, and Richard Feynman, then a doctoral student, picked it up to hear the voice of his advisor, John Archibald Wheeler. Wheeler skipped the greeting. He had solved a mystery no one else had thought to name, he said, and he knew why every electron in the universe carries exactly the same mass and exactly the same charge. The answer was that they are all the same electron.
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