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TIL “urchin” is an old name for hedgehog, which explains how sea urchins got their name

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dd18 TIL when Jennifer Aniston and David Schwimmer discovered they were earning more than their costars, they gathered the other four “Friends” cast members and approached the producers as a group to demand equal pay. Aniston and Schwimmer agreed to a pay cut so the other four would be paid fairly.
KOlaR TIL that moveable type printing was invented by a Chinese man named Bi Sheng 300 years before Guttenberg. He was largely forgotten due to his status as a peasant.
8ewAK TIL that when David Kaczynski wanted to read the Unabomber's anti-technology manifesto to see if it was written by his brother Ted, he had to use the Internet for the first time to access it.
nW9xP TIL Forcing your eyes to work harder doesn’t increase the strength of eye muscles so wearing lenses doesn’t increase your dependence on glasses. if one eye is weaker, your brain is trained to use the stronger eye and the weaker eye could turn into lazy eye
VBwEB TIL the earliest recorded murder occurred 430,000 years ago. The murder victim suffered two penetrating fractures on the forehead's left side and was found at the bottom of a 43-foot (13-meter) shaft