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TIL that Marie Curie's belongings are radioactive, including her lab notes, which are stored in lead lined boxes in the French National Library...

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X0MP6 TIL that Gillette assisted the U.S. Army in military intelligence by producing copies of German razor blades for secret agents venturing behind German lines, also manufactured razors that concealed money and escape maps in their handles, and magnetic double-edge blades that can be used as a compass.
LmOr TIL that praising a child’s intelligence may encourage them to only engage in low-risk tasks in which their intelligence won’t be challenged, as learning takes a backseat to praise-seeking. This will often last throughout adulthood. Want better results? Praise them on their efforts instead.
oRAgK TIL that in 1841, when President William Henry Harrison died just 31 days into his term, it wasn’t clear if the Vice President should become President. Vice President John Tyler took matters into his own hands and arranged for a judge to administer the Oath of Office in his hotel room.
Ve5B TIL special care was taken while restoring Shakespeare’s grave to ensure that his bones remained untouched as the epitaph on his tombstone reads: “Good friend, for Jesus’ sake forbear, to dig the dust enclosed here. Blessed be the man that spares these stones, and cursed be he that moves my bones.”
wLGM7 TIL that actor David Herman (Michael Bolton from the movie "Office Space") got himself fired from MADtv by screaming all his lines during read-through. Apparently, he wanted to leave the show to do other projects, but Fox would not let him out of his contract.