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TIL any person who succesfuly parachutes out of a failing aircraft is eligible to join the caterpillar club. You get a certificate as well as a caterpillar shaped pin and get to join their annual gatherings. People who escaped a failing aircraft with no parachute are denied entry

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p80be TIL about Placobdelloides jaegerskioeldi; a leech known as the Hippo Butt Leech who spends its life attached to the rectums of hippos
edQL TIL that someone survived a cardiac arrest and 2 hours and 45 min of CPR thanks to the help of bystanders and an automatic chest-compression system.
1gD8 TIL that the hoax, Dutch reality show De Grote Donorshow, where patients competed for a dying woman’s kidney, was created with the intention of raising awareness about the lack of organ donors. Six weeks after the show aired 12,000 new donors had signed up.
18Ar TIL Zebras are responsible for more injuries to US zookeepers than any other animal.
e08An TIL The U.S. National Library of Medicine studied children’s posture and found sitting on the floor has a positive effect on posture (Nearly Double) compared to using a traditional chair