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154

TIL The treadmill originated in prisons and were used to pump water or crush grain

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QJnDp TIL that until the 1970's, the words moron, imbecile and idiot were actually medical diagnosis
lo9vB TIL that children (and adults) in the US were tattooed with their ABO Blood group and Rhesus factor(Rh) by schools in the 1950s. With Cold War at its peak, children were included in this program to cover potential shortages in blood banks in case of a Soviet Union attack.
8emWL TIL of Nzeli, a female Gorilla monitored by the Fossey foundation: at 37 years old, she has been observed voluntarily switching between family groups 10 different times, occasionally leaving her infants behind
x6kN7 TIL about Helmuth von Moltke. He is the only person in the 18th century whose voice was recorded.
GYldG TIL Mathematician Leonhard Euler memory was said to have been so great that he was able to recite Virgil's Aeneid from beginning to end without hesitation. A text that is over 9000! lines long.