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TIL medieval and old stairwells go clockwise because an attacker would need to use their right hand to steady themselves and their left hand to hold a sword whereas a defender would hold a sword in their right and steady themselves on their left.

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16oX TIL That the first Computer Programmer was a woman
8erdL TIL of the Imperial Boomerang, which theorizes that governments that use repressive techniques to subdue colonies will inevitably end up using those same techniques against their own citizens.
Kp4 TIL that in the 18th century, to discreetly tax rich people more, Scotland, England and France imposed window taxes based on the number of windows your residence had. To this day you can see many bricked over windows from that time.
J7dB TIL in 1957 a Catholic priest produced a concept car designed to be extra safe. Its body was dent, rust, and corrosion proof and the seats swiveled to face rearwards upon collision. It also had hydraulic jacks, crumple zones and a roll cage.
5VP19 TIL: The image where the tongue folds the tip backwards and goes all the way into the nasal passage way is real- its name: Khechari Mudra.