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TIL the book Progress and Poverty by the economist Henry George, now largely forgotten, was once more widely read than any book except the Bible and was praised by Churchill, Einstein, Tolstoy and others

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QJle9 TIL that, in biology, any group of fish that stay together for social reasons are shoaling, and if the group is swimming in the same direction in a coordinated manner, they are schooling.
EOD0 TIL that Stand on Zanzibar, a book written in 1969 and set in the year 2010, predicted that world will have by 2010 a popular world leader named President Obomi, and that school shootings would be prevalent, among other near-accurate predictions.
VM40k TIL that the ruby-throated hummingbird can cross 800 km (500 mi) of the Gulf of Mexico on a nonstop flight.
WkWDA TIL: In the late 1800s- early 1900s butt plugs were available through prescription. They were used to treat constipation, hemorrhoids, piles, nervousness and even insanity. They were called rectal dilators.
Oo91 TIL some of the Koi San people of southern Africa hunt antelope by chasing them on foot until they get heatstroke. The antelope overheat before the humans do.