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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.

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D7nj TIL The Vikings used a stone which helped them track the sun for up to 40 minutes after it had set to aid navigating their warships
9nDD TIL Scientists at UCLA noticed that “time and time again” people suffered their first experience with anxiety or depression right after stomach illnesses. They did brain scans after patients ate probiotics, and found that stomach bacteria actually directly affected connectivity of the brain.
dDZAr TIL - Kangaroos don't have belly buttons. Marsupials and monotremes don't feed their unborn offspring via a placenta so have no umbilicus.
NLlQ TIL The original Girl with the Dragon Tattoo DVD was designed to look like a pirated disc which convinced many purchasers that they bought an illegitimate copy
kOPkE TIL Nativity scenes in Barcelona often traditionally contain one figure pooping off in the corner