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TIL about the Anti-Rent War, a tenets revolt in upstate New York where renters declared their independence from the manor system run by patroons, resisting tax collectors and successfully demanding land reform.

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6EVal TIL that the text in ReCAPTCHA security codes looks so strange because they're actually helping to digitize books and other text. The company has designed their system so that humans enter the words optical character recognition software can't recognize. Their old slogan was "Stop spam, read books."
v1yRL TIL there's a reason there's no generic insulin for diabetics. Its discoverers gave the patent to their university for $1, but the university couldn't make what was needed quickly enough. Drug companies have kept making small changes since the '20s to keep it from going generic.
Yp4jB TIL the song "Happy Birthday to You" is actually in the public domain and has been since since 2017.
X0Myr TIL of people of Jewish decent that served in the German Army in WW2. They ranged from Generals who were declared to be Aryans, waffen SS soldiers who hid the fact knowing their fellow soldiers would probably kill them to ordinary soldiers basically hiding from being sent to concentration camps.
ADbeB TIL that the country of Russia has more surface area than the continent of Antartica