Feynman’s Lost Lecture: The Motion of Planets Around the Sun

This is the story of how Feynman’s lost lecture came to be lost, and how it came to be found again. In April 1992, as Caltech’s archivist, I was asked by Gerry Neugebauer, the chairman of the Division of Physics, Mathematics and Astronomy, to go through the files in Robert Leighton’s office. Leighton was ill and had not used his office for several years. Marge Leighton, his wife, had told Neugebauer that it was all right to clean out the office – she’d already collected her husband’s books and personal effects. I could take what I wanted for the archives, and the division would dispose of the rest.

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