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TIL Pythagorean cup is a cup that automatically empties itself if you fill it too much.

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ne9yP TIL about the origins of US whistleblower protections. In 1777, 10 soldiers reported their commanding officers for torture. Instead of branding the soldiers as traitors, the Founding Fathers passed a law protecting them and future whistleblowers.
Lk9L9 TIL: Nearly a third of homicides go unsolved in the US each year
9YrZQ TIL Richard the Lionheart's mother, Eleanor of Aquitaine, was actually a rare female crusader who would march with her husband. However, their disagreements on battle plans eventually lead to the marriage being annulled, where she then after married a Norman and produced Richard.
xdx5 TIL that there is a cryptic organization called Cicada 3301 that posts challenging puzzles and games online, possibly to recruit codebreakers and linguists.
6EOgX TIL that, contrary to expectations, objects with greater drag generate less heat when entering the atmosphere. This is because a pocket of air forms in front of the object. After this was discovered in 1951, vehicles such as the Apollo capsule were designed to enter the atmosphere blunt-end first.