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TIL Male giraffes headbutt female giraffes in the bladder until she urinates. The male giraffe will then taste the urine to see if he can mate with her.

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WkZg9 TIL that elephants, known as one of the most intelligent species, are capable of recognizing their own dead and having some kind of grupal grief, as a funeral. They "mourn" their dead, showing curiosity, emotion and acting irregularly.
Wym9 TIL The current way Americans salute the American Flag (our right hand over our heart) was instituted in 1942, because the old way looked too much like the Nazi salute.
9Y6yX TIL that legendary mountain man Jim Bridger loved telling tall tales, his favorite being the story about his pursuit by 100 Cheyenne warriors ending in him being closed in at the end of a canyon. At this point he would stop, and when inevitably asked what happened next, would reply "they killed me."
yLye TIL Vin Diesel got his first acting role when he was 7. He and some friends broke into a New York theater to vandalize it. The theater’s artistic director confronted them, and instead of calling the police, handed them scripts and offered them parts in the upcoming show.
R7wn7 TIL about Harry Wesley Coover Jr who discovered super glue (cyanoacrylate) in 1942. He ignored it as being too sticky for what he needed. He then rediscovered it in 1956 while at Eastman Kodak who put it into production. It gained notoriety in the Vietnam War as a way to close battlefield wounds.