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TIL That evolution is faster in primates with larger testicles. A study of 55 species of primates found that there was a relationship between testicle size and genome mutation rates.

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D17NP TIL that Charles Darwin was one of the first people to come up with the idea of putting wheels on his office chair, so that he could work faster
yQxLe TIL of a rare variation of the game of checkers named Canadian Checkers - the board is 12x12 with 144 squares (as opposed to the European standard 10x10/100 square board)
R7G96 TIL that Aboriginal Australians often traveled to Indonesia for trade, and when British explorers first visited inland Australia they met an Aboriginal man who had already learned English from his visit to Singapore.
NXd1 TIL There was a dagger specifically for finishing off wounded knights. It’s called the misericorde, Latin for mercy.
gr0b4 TIL In 1910, a Spanish shepherd named José María Grimaldos López disappeared. Two men, León Sánchez and Gregorio Valero, confessed to his murder under torture and spent 12 years in prison. In 1926, Lopez returned home, alive and well. He had been living in a village 70 miles away the entire time.