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TIL Number systems, such as tallies marked into clay or wood, predate the invention of writing (and the beginning of history) by over 35,000 years!

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Ooa1R TIL For decades, Hulda Regehr Clark claimed to have the cure for cancer and made millions of dollars. She died of cancer in 2009.
0d0RL TIL that experiments conducted by academic specialists in animal communication "suggest that slow blink sequences may function as a form of positive emotional communication between cats and humans."
R7gDa TIL that Trevor Richards, a 16-year-old South African immigrant, got suspended from his Omaha, Nebraska school when he nominated himself for a “Distinguished African-American Student of the Year” prize. He was the only pupil in this school to have ever lived in Africa.
o7MY TIL, in 1962 under Centralia PA,one of the largest mines in the US caught fire. The fire formed sinkholes and vented lethal amounts of carbon monoxide forcing the evacuation of residents.Today the town remains abandoned while the fire continues to burn and is expected to do so for another 250 years!
b9w7Z TIL during the Depression, Frederick Mellinger, was fired from a job for proposing they sell black women's underwear instead of the basic white. He then joined the Army and found that men wanted to see pin-up girls in more risque lingerie. This caused him to make his own exotic line of lingerie.