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TIL that scientists found a drug called Tideglusib that can repair cavities by re-growing teeth

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8K1K TIL There hasn’t been a US President who wasn’t a Republican or a Democrat since 1853
VMLYB TIL in the 1920's newly hired engineers at General Electric would be told, as a joke, to develop a frosted lightbulb. The experienced engineers believed this to be impossible. In 1925, newly hired Marvin Pipkin got the assignment not realizing it was a joke and succeeded.
E1JAd TIL former Supreme Court Justice Oliver Wendell Holmes (1841-1935) met both John Quincy Adams and a young JFK. He'd also relate stories of his grandmother watching the Redcoats invade colonial America.
e00JJ TIL that during the summer of 1968 during which philosopher Jean-Paul Sartre was arrested for civil disobedience, President Charles de Gaulle intervened and pardoned him, commenting that "you don't arrest Voltaire".
MeggK TIL of the Benjamin Franklin effect that causes people to like someone more after doing them a favor. When Franklin asked his rival for a rare book and returned it with a note of thanks, Franklin’s rival spoke to him with great civility and offered help, leading the two men to become good friends.