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TIL scientist Claire Patterson spent over 20 years trying to convince the public that lead was poison.

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via reddit.com

gY57 TIL: the reason grass makes you itch is because it actually cuts your skin with its serrated edges.
yVjWa TIL the first scientific article on the greenhouse effect was published back in 1856, 165 years ago! The article was written by a female scientist - Eunice Newton Foote
BrV0K TIL: A book created by nazi doctors by means of dissecting thousands of executed prisoners is still used today as one of the most detailed medical books for surgeons. It’s quoted as being one of the great moral enigmas
yQ15V TIL Men and Women Misperceive What the Opposite Sex Finds Attractive. Women overestimated men's preference for thinness in female partners. At the same time, men overestimated women's preference for muscularity in male partners.
4XXpb TIL that in 2015, the NFL was flooded with complaints from colorblind fans after staging a Bills/Jets game in which the Bills wore all red and the Jets wore all green. It was supposed to be a "Color Rush" game celebrating the 50th anniversary of the NFL's first color transmission.