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TIL that the first tiger shark to hatch inside it's mother's uterus eats all the other embryos, and at least one scientist has been bitten by unwisely sticking a finger in a pregnant tiger shark's uterus

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via reddit.com

YE8r TIL an English organist named Jeremiah Clarke wanted to commit suicide. He couldn’t decide whether to hang himself or drown so he flipped a coin. The coin landed on it’s edge in the mud so he ended up shooting himself instead.
ZmyQ TIL that the term ‘sour grapes’ originates from the Aesop’s fable “The Fox and the Grapes” (620–564 BCE), in which a fox, unable to reach grapes he is seeking, decides that they must have been sour. The moral that accompanies the story is that “any fool can despise what he can not get”.
N7gd6 TIL chilli peppers are used to make paint for ships to prevent barnacles from settling on them. This is a better alternative than toxic paint and is used because barnacles can make a ship use up to 30% more fuel.
v0X8 TIL When Sati was prohibited in India. Charles Napier told protesting Hindu priests “Be it so. This burning of widows is your custom; prepare the funeral pile. But my nation has also a custom. When men burn women alive we hang them, and confiscate all their property…”
P1Z6V TIL of Dr Joe Holland, who in 1917 guided the Postmaster in the Outback town of Halls Creek to perform surgery (repair a ruptured bladder) on an injured man via Morse code. Dr Holland then raced 2800km from Perth to reach Halls Creek via ship, model T Ford and the final 40km on horseback at night.