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TIL humans can't actually smell metal. Instead, whenever we touch metals it is a reaction between oils on our skin and the metals which we are smelling.

Read more nature.com

via reddit.com

XEVOj TIL the original version of The Game of Life (then called The Checkered Game of Life, released in 1860) had a 'Suicide' space that would cause you to instantly lose.
rRmaw TIL at one point 90% of the world's needles came from a Worcestershire town called Redditch.
E10ox TIL that Göttingen, a small German university town, was for centuries one of the most productive centers of mathematics in history, developing geniuses such as Gauss, Riemann and Hilbert. But its fall took less than a decade when its stars were pushed abroad by the Nazis.
YpOnZ TIL an actor accidentally slit his own throat on stage while performing a suicide scene in a play based on Mary, Queen of Scots. The prop knife he was supposed to have used had been switched with a real one. If he’d cut a little deeper, he would have died.
XO6Q TIL that a man and nine of his friends played a game of tag for 23 years. The game had no geographic limits, and only went live in the month of February, meaning that if you were tagged last, you were “It” for a year.