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TIL in 2013 research was conducted on Capri Sun that filtered it through a vacuum to see what would be left behind to grow on the filter paper. Researchers identified five species of fungus notating that because they don't put preservatives in the drink, it allows lots of fungi to survive

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veLr TIL letters sent to London Newspapers by Jack The Ripper had a sample of saliva from their stamps tested in 2006. The results seemed to point to the sender of the letters being a woman.
JYDeV TIL that Mr. Rogers was a vegetarian, a ordained minister, and a recipient of the presidential medal of freedom.
KOOW4 TIL that the official definition of 1 second is based on a quantum mechanical phenomenon, namely "the duration of 9,192,631,770 oscillations of a Caesium 133 atom's outermost electron"
4Xa65 TIL In 2012, a Polish woman set the record for labor duration. Joanna Krzysztonek was in labor for 75 days straight. At the insistence of her doctors, she had her feet above her head for part of that time.
XEDZ8 TIL in the late 1800s Australian surveyors had realised the two tallest mountains, Mt. Kosciuszko and Mt. Townsend, were mismeasured, and in fact Mt. Townsend was taller. Instead of rewriting many textbooks the NSW government decided to switch the two names, leaving us with what we have today.