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TIL that printers sometimes call the exclamation mark (!) a 'dog's cock'

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N8Db TIL that the Type A/B Personality Theory was actually invented by the cigarette industry in the 1950’s to prove coronary heart disease and cancer were risks related to high-stress personality types instead of tobacco use.
QJ1Dd TIL James Derham was a black man who worked as an assistant under several doctors who owned him in the 1700s. He learned about medicine from them which lead him to open his own practice after he was freed. He was the first African-American to practice medicine in the U.S.
YEB7 TIL the president of Georgia (the country) fired the entire Georgian police force in 2005 because of its corruption.
nXjo TIL that if you fall in a pool of lava, you will not sink into it. the density of lava is three times greater than a human body and between a hundred thousand to a million times more viscous than water
KYQxG TIL about the Janzen–Connell hypothesis, a widely accepted mechanism that asserts that a forest with more diverse species of plants will prosper because the more common a plant species is, the more specialist enemies it attracts.