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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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m1EZO TIL Canine Distemper Virus is lethal to pandas. Between December 2014 and March 2015, five captive giant pandas died due to canine distemper virus (CDV) infection in China.
W7GMN TIL that “bookworms” aren’t just a term for readers—bookworms are actual bugs that used to burrow into ancient books, damaging them by eating the binding glue and paper fibers.
KyGR TIL that during the Space Race, NASA turned the creation of a functional spacesuit that could withstand the harsh conditions of space into a competition. It was largely dominated by military contractors. However, Playtex, the bra maker, entered and won the competition.
neb9 TIL Lego is the largest manufacturer of tires in the world
dvd8 TIL Just 1 gram of DNA is theoretically capable of holding 455 exabytes – enough for all the data held by Google, Facebook and every other major tech company, with room to spare