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TIL in the Wizard of Oz, the Wicked Witch’s makeup was toxic and copper-based, so her face remained green for weeks after they finished shooting.

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akQ9 TIL that from 1946 to 1948, nearly 700 Guatemalans were deliberately infected by American doctors to study the effects of venereal disease. The US didn’t formally acknowledge the study or apologize till 2010.
BMXK TIL Roald Dahl helped create a cerebral shunt initially designed for his son, and has helped over 3000 children across the globe
NeJP TIL There is a road safety system called “Shared space” that relies on psychology. Traffic signs, kerbs and road markings are removed from town centers. Without markings drivers are more cautious and aware of their surroundings and thus slow down and pay more attention.
epwyD Today I learned that people with poor eyesight tend to be more intellectually inclined.
BgWad TIL Some shoe companies will sell shoes with “fuzzy bottoms/soles” (think inexpensive shoes sold at places like Walmart, Target, etc) because they can legally classify them as “slippers” changing import tariff from 37.5% to just 3% despite them clearly being sneakers