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TIL The air conditioner could lead to an increase in allergy symptoms causing sneezing, and the air inside homes is said to be up to five times more polluted than the air outdoors

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via reddit.com

KDxJ TIL that there is a hanging display in Chicago of 58,226 dog tags of every American soldier killed in Vietnam.
Eg9dX TIL of the Euphemistic Treadmill whereby euphemisms, which were originally the polite term (such as STD to refer to Venereal Disease) become themselves pejorative over time.
69B4Z TIL that the top of Mount Chimborazo is farther from the Earth's center than Mount Everest
BryrK TIL in South Korea, a woman obtained her driver's license on her 960th try.
loXoA TIL of Billy, an enslaved man from Virginia who was charged with treason during the American Revolution. He won his case by arguing that, as a slave, he was not a citizen and thus could not commit treason against a government to which he owed no allegiance.