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TIL The phrase "mad as a hatter" originated in the hat making industry of the 18th century as mercury nitrate was a vital substance used in the production process. This lead to a variety of physical and mental ailments, including tremors (“hatter’s shakes”), speech problems, emotional instabilities.

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OolGa TIL that London is farther north than Calgary, Montreal is south of Paris, and despite being 20° further north, Reykjavik’s average temperature in January is warmer than Boston’s average temperature. The reason for milder European climates than equivalent cities in North America is the Gulf Stream.
Vbpm TIL that there is a town in northern Kazakhstan where residents fall into a deep sleep for up to 6 days at a time. No abnormal radiation or gas levels have been detected and to this day, no one knows why.
E1PJW TIL Bonnie and Clyde were so impressed by the 1934 Ford V-8 Model B, that they wrote a letter to Henry Ford expressing that the Model B was the perfect getaway car.
16897 TIL about George Spencer. He was executed by hanging for charges of sodomy after being convicted for an alleged sexual act with an animal. When a sow gave birth to a malformed piglet resembling Spencer, it was believed that this was irrefutable evidence that an act of bestiality had taken place
ANGNg TIL: There are several studies that prove heterosexual men act differently around women, but in unexpected ways. Men are more likely to jaywalk, wait until the last second to dash onto a bus, take more risks while gambling, volunteer/donate more, etc. The effects are strongest in single young men.