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TIL although acne affects 79-95% of western adolescents, a study of non-westernized tribes in Papua New Guinea and Paraguay found no cases of acne.

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Anpg TIL Gary Gygax had been asked if he invented roleplaying. He modestly responded “No, as long as kids have been playing cops and robbers or cowboys and indians, they’ve been playing roleplaying games.”
vPZbL TIL there's an Underground river beneath the Amazon River, it was discovered in 2011 and its about as long as the Amazon river, but it is much broader. It's unofficial name is the Rio Hamza
QmbL TIL the first stapler was made in the 18th century for King Lioux XV and each staple was inscribed with the insignia of the royal court.
8awRa TIL Los Angeles may spend billions to turn the Hoover Dam into a gigantic battery by pumping water back up into Lake Mead at times when solar energy is cheap
v1J1K TIL Shakespeare didn't write alone - he had a co-writer for at least three of his plays ( Henry VIII, The Two Noble Kinsmen and a lost play called Cardenio)