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TIL that canned tuna (and other fish) contains small doses of mercury (the poisonous metal found for example in old thermomethers)

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via reddit.com

bQ67 TIL “The German naturalist Alexander von Humboldt in South America in 1800 encountered a very old parrot that was the sole speaker of a dead Indian language, the original tribe having gone extinct.”
N75oE TIL of Iqbal Masih, a young boy who was rescued from slavery at a carpet loom. This young activist was assassinated at the age of 12 in Lahore, Pakistan, in 1995 by someone believed to be a feudal landlord and carpet manufacturer.
X0Yvk TIL that in January 2010, the city of Black Hawk, Colorado forbade riding bicycles in their streets (except for town locals). The law was later reversed by the Colorado Supreme Court in 2013, primarily on grounds that Black Hawk never provided alternative paths for bicycle riders.
QmPM TIL that, despite box office records being broken every year, only one film in the 21st century so far has managed to sell more than 100 million tickets domestically - Star Wars: The Force Awakens.
1JD7 TIL that the first movie shown in a theater setting caused the audience to run away because they thought a train was going to come out of the screen.