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TIL about Reverse Polish notation, which is a different style of writing math equations. 3+4 is instead written as 3 4 +. One pro is that it removes the need for the Order of Operations.

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L40v TIL that the “Most Interesting Man in the World” (Jonathan Goldsmith) played an unnamed redshirt on an episode of Star Trek - and survived the episode
neR5W TIL in the 17th century, courting teenage couples were tied into thick sacks called bundling bags and left to spend the night together chastely in the same bed
mk7v TIL that an elephant’s ability to smell water is so refined, they can sometimes detect water sources from as much as 12 miles away
BrVLr TIL of the term "paraprosdokian" - a figure of speech in which the latter part of a phrase is surprising in a way that causes the reader or listener to reinterpret the first part. An example would be Mitch Hedberg's famous one-liner "I haven't slept for ten days, because that would be too long."
4eaR TIL, for the 1993 movie Jurassic Park, Steven Spielberg wanted the velociraptors to be about 10 feet tall, which was taller than they were known to be and had dinosaur fans everywhere complaining. During filming, paleontologists uncovered 10-foot-tall specimens of raptors called Utahraptors.