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TIL in nautical terms, the chain that attaches to the corner of a sail is known as a "sheet". The expression "three sheets to the wind", which implies that someone is inebriated, refers to those chains being loose, allowing the sail to wave around wildly in the wind like a drunk.

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Bgp7y TIL before the appearance of the anus, animals had to eat and excrete through the same hole. The anus allowed for a more efficient system, and allowed animal life on Earth to grow bigger and take on new shapes and forms.
YpjkZ TIL that the James Webb Space Telescope not only missed its launch date by 14 years so far, but has also missed its designed mission end date by 9 years.
pYBwN TIL Pixar renders its animated movies with one of the top 25 supercomputers in the world; with all that power, it still took 2 years of processing to render every frame of Monsters University.
691DW TIL crows can report on what they've seen, and change how they report it based on how they are asked to do so.
1yR8 TIL the actor who played Boba Fett in the original trilogy was cast solely based on his uncannily fitting the costume which had already been made.