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TIL Londoners in the 1600s were advised to keep "fart jars"— consisting of trapped fart odors—on hand to combat bubonic plague. The idea was that the potent smell would somehow purify the air.

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ZyOB TIL 171 people have vanished off Cruise liners in the last decade.
pj0A TIL Bob Ross had to find ways to cut back on spending, so he decided to have his hair permed just to save money on haircuts. The perm hairstyle was not comfortable for Ross, but it became an iconic feature of his image and brand.
LkK90 TIL about a Swiss satellite designed to clean up some of the space debris that orbits the Earth as a result of sending objects in space. A "janitor satellite".
v1Dkx TIL 'slide to unlock' feature of iPhone was introduced after the UI designer, Freddy Anzures noticed the slide to lock/unlock mechanism on airplane bathroom door
rNnv0 TIL that the crew of Mr. Rogers' Neighborhood rarely talked to Fred off set and "mercilessly made fun of him behind his back". Some of the crew would also go into the studio before shows when Fred was rehearsing with the puppets, in order to ask his puppets for advice, which Fred gave them.