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TIL that sirens are designed to trigger fear circuits in the brain.

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mbbM TIL Galaxy Quest, a satire of Star Trek and fandom, is so popular with the latter’s fans that it was named the 7th best Star Trek film at the 2013 Star Trek Convention. Actors of TOS, TNG, Voyager and DS9 also have expressed admiration for the film.
N44b TIL William Whipple, upon signing the Declaration of Independence, freed his slave believing he could not fight for liberty and own a slave.
9pDQ TIL that up to 10 people contract the Black Plague in the US every year
b95Vj TIL about the Devil's Chair, a graveside bench in the cemetery in Cassadaga, Florida. According to local legend, an unopened beer left on the chair will be empty by morning. The Devil is sometimes said to appear to anyone bold enough to sit in the chair.
pl1O TIL that bioluminescence is one of the most common and least understood forms of communication on Earth.