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TIL there are contact lenses you wear only while sleeping that reshape your cornea so you can see clearly all day without glasses. It is called “Orthokeratology”

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wLKQW TIL of the Taman Shud Case; a mysterious stranger was seen behaving strangely in a small Australian town in 1948. The next day his dead body was found holding a scrap of paper with a mysterious code on it - to this day he remains unidentified.
8DwL TIL that a Johns Hopkins professor procured 34 gallons of whiskey during prohibition for his research. He observed that subjects got better at throwing darts as they got drunker.
b0lE TIL a scientist in the 60s gave LSD to dolphins in an attempt to teach them English.
XyR TIL that mimicking the behavior of others causes you to be perceived as more friendly by interlocutors. This is known as “The Chameleon Effect.”
BgoPd TIL: The construction of the Cologne Cathedral (Kölner Dom) began in 1248 and wasn’t completed until 1880—taking over 630 years due to centuries-long pauses, changing styles, and revived interest in Gothic architecture centuries after it started