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TIL that porcupines sometimes fall out of trees and injure themselves on their own quills. As a result, they have evolved to produce a topical antibiotic on their quills to protect against infection from self-wounds.

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DQOlg TIL about autogynephilia, a sexual arousal for a man in imagining himself as female.
b9n19 TIL the CIA once paid prostitutes to lure individuals into monitored safe houses in New York, San Francisco, & Marin. The prostitutes then gave their clients LSD and other substances while the CIA watched through one way glass.
NXre8 TIL Nintendo was founded in 1889 as a playing card company. They didn’t make their first video game until 1978.
4OwX TIL Samuel L. Jackson got rid of his stutter by developing an affinity for the word “motherfucker”
x8o7 TIL Isaac Newton thought he could turn water into gold, and died eating mercury.