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TIL Some species of hermaphroditic flatworm engage in a violent "penis fencing" ritual when mating. The winner of which stabs the other with its sharp tip and inseminates the loser.

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mDxE TIL that in order to convince his first wife to agree to a divorce, Albert Einstein promised her the full monetary award when he wins the Nobel Prize. Three years later, he won the prize and transferred all the money to her.
5n7p TIL that in 1976, North Korean soldiers murdered two American officers who were trying to trim a tree in the DMZ. The U.S. responded by sending a 813-man task force to cut the tree down.
Bre7b TIL that reading all privacy policies the average internet consumer encounters in a year would take 76 work days
OGbm4 TIL that on 27 April 1865 the steamboat Sultana exploded on the Mississippi, killing about 1,700 mostly Union POWs—the deadliest maritime disaster in U.S. history
wAj8 TIL Tokyo has a self-declared superhero who calls himself Mangetsu Man. He keeps his identity secret by wearing a purple bodysuit, with a big yellow smiley head; and his self-described job is to keep the city trash free.