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TIL "OK" is an acronym for "Oll Korrect," a purposeful misspelling of "All Correct," as a joke in 1800s newspapers.

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wLBj7 TIL that only mammals to experience menopause are humans, killer whales and pilot whales . It is thought that older females have evolved to forfeit their ability to reproduce so they can use their energy to nurture their daughters’ offspring. This is known as the ‘grandmother hypothesis’.
0wWLA TIL of the Mannanafnanefnd. A committee in Iceland that determines whether a name is suitable for integration into the Icelandic language. New names are considered based on compatibility with Icelandic tradition and the likelihood that it might cause the bearer embarrassment
DQBrv TIL Dr. Phil lost his license to practise psychology in 2006. Therefore, all guests on his TV show must sign a contract stating they are only there to receive "advice" from an individual, not a psychologist.
7rZLZ TIL "Phil McNamara was able to capture something not a lot of people get to see: the exact moment an active volcano blows its top, and the attendant shockwave. Filming off the coast of Papa New Guinea, McNamara filmed the start of the eruption of Mount Tavurvur volcano on August 29th, 2014." [Video]
698Yl TIL a young woman's head swelled from her usual measurement of 22 inches to 24.8 inches (and the shape of her face changed) after she used hair dye. This was because the hair dye had a chemical in it called PPD (paraphenylenediamine), which can cause serious allergic reactions in certain people.