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TIL gender can now be determined from the concentration of amino acids in a fingerprint (levels are significantly higher in the sweat of women than that of men). The testing method can be performed at the crime scene and works in a manner similar to pregnancy strips or glucose meters.

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YpRNr TIL a 2009 study found that two years after retirement, 78% of former NFL players are under financial stress or have gone completely bankrupt.
5Y7Or TIL that in 2010, a Canadian man rescued a newborn baby from a dumpster, only to find out he was the father.
E1Zex TIL that the word 'bald' in 'bald eagle' has nothing to do with the definition as a lack of hair. Rather, the term bald eagle is derived in English from the word 'piebald', in reference to their white heads and tail feathers in contrast to the darker color of the rest of their bodies.
Z8YWp TIL about the death of Elisa Lam, a Canadian student at the University of British Columbia who disappeared while staying at the Cecil Hotel in Downtown Los Angeles. Only later to be found in the water tank when guests complained of problems with the water supply.
R5Wg4 TIL that the ancient Olmecs believed in werejaguars, similar to the werewolf in European cultures.