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TIL John Quincy Adams (6th US President) was a 'hollow earther' and wanted to meet 'the mole people'. He authorized an expedition to find them.

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KmN6 TIL that Volvo invented most important safety device ‘Three point seat belt’. Volvo could have netted a fortune on patents alone but gave free license to all other auto manufacturers to use it as free life saving tool than something to profit from.
ne0W TIL there is a man in Australia who ages so slowly that by age 40, he is only at the developmental level of a 10 year old
DQGkY TIL of “character amnesia,” a phenomenon where native Chinese speakers have trouble writing words once known to them due to the rise of computers and word processors. The issue is so prevalent that there is an idiom describing it: 提笔忘字, literally meaning "pick up pen, forget the character."
ZLKB TIL Elephants have 1 large molar tooth per arch and are replaced 6 times in their lives. As the teeth are worn down the 6th set of molars must last the rest of their lives or else they cannot eat anymore and die of starvation.
4brJ TIL that between 1924 and 1925, 5.26% of the US population or 6 million people were members of the KKK.