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TIL that an optical illusion occasionally makes the city of Chicago appear upside down.

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kOYp1 TIL: that the phrase ‘devil’s advocate’ comes from a medieval job title. The ‘advocatus diaboli’ was the guy tasked with coming up with counter arguments when a priest was nominated to be blessed or canonized.
v1bE4 TIL: Wikimedia Commons hosts the iconic golden age porn flick "Debbie Does Dallas" in its entirety because it is in the public domain. Despite the movie selling over 50k video tapes, the producers never registered for a copyright within 5 years of the release.
6EPXW TIL fiber-optic internet cables on the sea floor has to be wrapped in kevlar to protect them from shark bites
npwG TIL that the first pregnancy tests on record were in Ancient Egypt. Women would pee on a field of wheat and barley. If the wheat sprouted, it was going to be a girl. If the barley sprouted, it was going to be a boy. If neither sprouted, the woman wasn’t pregnant.
Egb7d TIL of Bell, a slave of Bengali origin in 18th century Scotland, that may have been wrongfully convicted of infanticide after giving her child Hindu burial rights.