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TIL before police used fingerprints to identify individuals, they used a system called Bertillonage which used several measurements of different body parts. It lost popularity when Leavenworth prison had two inmates with the same name, measurements, and physical appearance.

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VMKg0 TIL In an epilogue at the end of the original 1931 Dracula film, Dracula breaks the fourth wall and taunts the audience, saying vampires are real and to be afraid. In a 1936 re-release, this was censored by the Hays Code, out of fear it would encourage belief in the occult.
EpbW TIL in 1994 toxic fumes from a dying woman’s blood caused an ER to be entirely evacuated, with 23 of the 37 staff sick, 5 of whom were hospitalized themselves, one in intensive care for two weeks.
5GEn TIL Duff McKagan, former bassist of Guns N’ Roses, claimed that Duff Beer on The Simpsons was named after him. Matt Groening, creator of The Simpsons, called the claim “absurd”.
8aQD8 TIL: Friday the 13th occurs on an average of once every 212.35 days, but the next one is 427 days away, in September of 2019, being more than double the average.
n8lo TIL: The discovery of insulin, and the mechanism underlying diabetes, was prompted by the observation that ants were attracted to the urine of dogs that were missing their (surgically removed) pancreas.