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TIL of Wall-Sun-Sun primes, a category of prime numbers that obey certain rules related to the Fibonacci sequence. It is conjectured that there are infinitely many of them. None are known, and there are definitely none that are smaller than 20 digits.

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ZRp TIL there is a species of shrimp that stuns its victims to death with extreme noise and is considered to be a major source of noise in the ocean.
nWLrr TIL there are over 50 million slaves in the world 1 in 150 people. More slaves now than at any point in history
oVkY TIL that according to a 2011 poll, 32% of Russians believe that the sun orbits the earth.
GjK7 TIL in WWII the wife of a Russian Officer found out her husband was killed in action and wrote a letter to Stalin stating: She build a tank, wants revenge on “the fascist dogs”, Stalin’s permission for her to be sent to the frontline and to name her tank ‘FIGHTING GIRLFRIEND’. Stalin said yes.
nvO7 TIL Arrichion, a wrestler in the ancient Olympics won a match by using a maneuver which caused his neck to break, killing him instantly. His opponent suffered from a dislocated foot, and submitted. Arrichion was named the winner.