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TIL the American spelling of aluminum (as opposed to aluminium in other countries) is the result of a misspelling by the inventor of a refinement process named Charles Martin Hall. The process was so revolutionary that the spelling stuck.

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x6beD TIL of the "Shoe Fitting Flouroscope" or "X-Ray Shoe Fitter" which existed in shoe stores up until the 70's - Allowing customers (mostly children) to look through a viewer at a live X-Ray of their feet, to see the bones of their toes and how they lined up with the stitching of the shoe's sole.
vPeJD TIL that during the Apache Wars in the American Southwest, the Apache would cut the Army's telegraph lines but reconnect the ends together with a strip of leather to make the break in the circuit nearly impossible to find.
wL1wW TIL: In 2018, doctors found that a patient, Kendra Jackson, had a leaky brain for 5 years. After an accident in 2013, she had a daily runny nose for years and suffered headaches. She lost half a pint of brain fluid a day through her nose.
wL1eE TIL only 128 people in the United States are licensed to fly blimps
X0w5j TIL the first depiction of backward time travel is believed to be in the Chinese novel "Supplement to the Journey to the West" (1640) by Dong Yue, which features magical mirrors and jade gateways that connect various points in time.