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TIL: People used to perform pregnancy tests by injecting urine into a frog. If the frog is female and has eggs at near its rear end after 12 hours then the woman is pregnant. If the frog is male and produces sperm, then the woman is pregnant.

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5YAr9 TIL In 1978, two Monty Python comedians shot a scene dressed up as John Lennon and Paul McCartney and then tourists, thinking they were the Beatles, asked for their autographs, while the actual George Harrison, who they didn’t recognize, stood nearby laughing his ass off.
j6y6j TIL Thomas Midgley Jr. had the most adverse impact on the atmosphere than any other single organism in Earth's history due to his invention of leaded gasoline and chlorofluorocarbons (two of the world's most harmful chemical compounds)
lokAa TIL researchers have been working for years to develop a strain of coffee plant which is naturally decaffeinated. While they made progress, there's a big drawback. Caffeine functions as a natural insecticide. By removing it from the plant, you leave the crop more vulnerable.
GYeL7 TIL the stem that connects your eye to the brain takes a small space in the back of your eye where photoreceptors can't be. This makes a natural blind spot for everyone that is only overcome because your second eye compensates.
yVlWX TIL about the Great Green Wall — a UN project to stop the Sahara from expanding south