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TIL moss grows in sloths' fur, and there's a moth species that only lives in sloth fur moss. Sloths make risky descents to defecate rather than defecating from the canopy so moths which lay eggs in their dung and make their moss more nutritious can live in their moss.

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WV08 TIL the zero-gravity scenes in Apollo 13 are actually real. The crew filmed 4 hours of material in 612 parabola flights.
VMyOD TIL a man became a millionaire by selling fake dog balls. Neuticles are prosthetic testicles implanted to help avoid the trauma of altering the pet. A $2800 pair has even been made for an elephant.
l7xPB TIL about the Children’s Crusade, where thousands of European children thought that God would allow them to take over Jerusalem, even though 3 previous crusades had failed
mx4vP TIL on January 22, 1943 in Spearfish, South Dakota, the temperature rose from -4 at 7:32 a.m. to 45 degrees–a rise of 49 degrees—in just two minutes. A couple of hours later, it plunged from 54 back to -4 degrees–a change of 58 degrees in 27 minutes
e0a04 TIL that Stardew Valley was created by Eric Barone who was the sole developer on the game. He did all of the programming, designed all of pixel art and produced all of the music. He graduated with a computer science degree in 2011 but couldn't find a job in the industry and made the game. Inspiring.