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TIL a small magnet implanted in a finger can allow one to sense magnetic fields. This body mod can be very useful in professions that work with electric currents, allowing the detection of live wires and avoiding electric shock.

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wv8 TIL that the opening song sung by prisoners in “O Brother, Where Art Thou” was a recording of actual prisoners in 1959, and one of the prisoners was tracked down and paid 40 years later.
gONA TIL that Brian May, the guitarist of Queen, built an electric guitar from scratch with his father when he was 16 years old, and called it the Red Special. He used that same guitar for his entire career, and it is his most prized possession.
GAZYQ TIL the 2007 PS3 game The Darkness contains a viewable version of the entire 1962 film To Kill A Mockingbird during a cutscene with the main character and his girlfriend.
6v5X TIL X and Y chromosomes weren’t named for their shapes, it’s entirely coincidental that they look that way during mitosis!
a8VrM TIL that at the Battle of Aspern-Essling in 1809, one of the French Generals was decapitated, while he was talking to a friend.