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TIL The term "Patient Zero" was actually “Patient O” as in the letter O, meaning that the person was from “outside” California. The ambiguous circular symbol on a chart was later read as a zero and the term became widely used.

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via reddit.com

69deX TIL about the origins of the expression “the toolies” (the Aussie version is NSFW)
jNmJa TIL the practice of “topping out”, a ceremony symbolizing the completion of a building or its skeleton, dates back over a thousand years and is celebrated worldwide.
OoBjR TIL: a Florida Man shot neighbour's cat because it 'looked at him like he owned the place'
oyA7 TIL that in the 1992 hit single, “Baby Got Back”, the phone number 1-900-MIX-ALOT was a real number, which was a Sir Mix-A-Lot themed phone sex service
bkd7 TIL that the company that created Zyklon B, the gas that was used to kill millions of Jews in the Holocaust, still exists, it is currently a pest control company.