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TIL Roger Cotes, a young astronomy professor at Cambridge, forced Newton to confront his mistakes in his work, Principia, and corrected many of them for him. Cotes bombarded Newton with letters for years, repeatedly challenging his experimental results as well as his theoretical calculations

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gMEjX TIL the Washington Monument contains a piece of the Parthenon, sent by Greece as a memorial stone during the Monument's construction.
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