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TIL of coin clipping, the act of shaving off a small portion of a precious metal coin for melting the clippings into bullion or to make new coins. Coin clipping is why many coins have the rim marked with stripes or other engravings, a counterfeiting practice devised by Issac Newton.

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Xv7P TIL octopi have 9 nine brains, one for each tentacle and a central one inside their head
VBEd4 TIL That the song "Winchester Cathedral" by The New Vaudeville Band topped the Billboard Charts twice in 1966, knocking out The Surpremes' "You Keep Me Hanging On" and The Beach Boys' "Good Vibrations" for the #1 spot
oB7ro TIL the prop used as Radar O'Reilly's teddy bear in MAS*H was a 1950s-vintage Cubbi Gund Cuddle Bear. Considering the television show was set during the Korean War, the prop master chose a Teddy bear that would have been appropriate for the time period.
VPwk TIL that the body of Vladimir Lenin, founder of the Soviet Union, has been preserved since his death in 1924, and is on display in Red Square
yVPNa TIL that the oldest surviving intact videotape and kinescope program is “The Edsel Show”, aired October 13, 1957