Principia
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Principia, also more known as Philosophiæ Naturalis Principia Mathematica was a book by Isaac Newton which explained his theory of gravity. It was published on 5 July, 1687. (PROSE: Time Traveller's Diary, Newtons Sleep)
As a young boy, Newton encountered an angel which showed him his future, in which he remembered writing the Principia. (PROSE: Newtons Sleep)