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TIL: In 1947, the Superman radio show did a series called "Clan of the Fiery Cross" in which they exposed many of the KKK's most guarded secrets. Within two weeks of the broadcast, KKK recruitment was down to zero. And by 1948, people were showing up to Klan rallies just to mock them.

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ZWD4 TIL there is an “official” unicode anger symbol. It’s ? which represents veins on your forehead when your blood pressure rises.
4XpnJ TIL that human laughter evolved from the distinctive panting by our great-ape relatives during rough and tumble play; that panting functions as a signal that the play is all in good fun and not an attack.
eKxn TIL Stairwells in medieval castles curved very narrowly and clockwise. Attackers coming up the stairs had sword hands (right hand) against the interior curve of the wall and made it very difficult to swing their swords. Defenders had their sword hands on the outside wall giving much room to swing.
5YK5n TIL there’s a real genetic disorder called Congenital Insensitivity to Pain with Anhidrosis (CIPA) that causes symptomatic carriers to be unable to feel pain. They also can’t feel temperature or produce a sweat, causing 20% with the condition to die before age 3 due to overheating.
kJ0RW TIL that Punxsutawney Phil and his ancestors have an accuracy rate of 39% going back to 1887