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TIL using Teflon and other non-stick cookware can kill birds. After new pans are heated for the first time, birds can die within a matter of hours.

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via reddit.com

J5pB TIL of Harvard Observatory astronomer Henrietta Swan Leavitt; given the boring job of examining the luminosity of stars in thousands of photos, she discovered how to measure the distance between the Earth and faraway galaxies. At the time, she was not allowed to operate Harvard’s telescope.
Xw7j TIL kids who try to act cool in their early teens are more likely to have alcohol and relationship problems later in life.
d8geQ TIL that between years 4000 and 3500 BCE the Tripolye culture centered around modern Moldova in Eastern Europe have built the largest settlements in the world at the time, inhabited by 20,000 to 46,000 people. Cities of this size only reappeared in Mesopotamia a millenium later.
7rGRX TIL that the founder of T-Series, Gulshan Kumar, was murdered in August 1997 by the Mumbai Organised Crime Syndicate for refusing to pay protection money to them. This exposed the decades old nexus between Mumbai Gangs and Bollywood.
P14NE TIL of Rene Lima-Marin, a Colorado inmate who was mistakenly released in 2008, 90 years early from a 98-year sentence. After six years of rebuilding his life with a family and steady job, he was returned to prison in 2014, raising issues of fairness and rehabilitation.