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TIL A clock’s hands moving ‘clockwise’ was intended to imitate the way the shadow on a sundial in the Northern hemisphere moves during the day.

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1arLO TIL - The inventor of the black box only worked on it in secret, and it was originally rejected by the aviation community due to privacy concerns. Before the invention, troubleshooting crashes was extremely difficult, and lessons learned from black boxes have improved airline safety significantly.
4656 TIL an 18 year old marine singlehandedly persuaded 1,500 soldiers at the battle of Saipan to surrender. He was only able to do this because his japanese foster parents had taken him in off the streets when he was 12 and taught him their language.
PYKGe TIL Even though a chess grandmaster can perfectly rearrange a midgame chessboard after seeing it for only 3 seconds, they can't do the same when the pieces are placed at random. They rely on a process called "chunking" (pattern recognition) vs common perception that they have photographic memories.
4XAa TIL “When flatworms mate, two "males” use their bifurcated penises to fence one another. The winner, or the flatworm who stabs the other with its penis, remains male while the loser becomes female.“
xMZB TIL, Santa Claus in the Marvel Universe is the most powerful mutant ever detected by Cerebro