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TIL in 2013 'Scientific American' analyzed the characteristics of all emerging diseases, they found "all known diseases of the 20th century were linked to sudden human population growth, new human activity in the environment and high wildlife diversity in the area where the pathogen originated."

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via reddit.com

8e448 TIL about a Frenchman named Tarrare, who was a French showman, soldier and spy known for an unusually large appetite. He could eat live animals, quarter of a bullock in a day, he was suspected of eating a one year old toddler while in the hospital. Finally died of exudative diarrhea and tuberculosis
PY8Vw TIL of "Hickam's dictum," a counterargument to Occam's razor in the medical profession. While Occam's razor suggests to a doctor that she should assume the simplest solution - a single cause for multiple symptoms, Hickam's dictum states: "A patient can have as many diseases as he damn well pleases."
GAR5g TIL Crown shyness is a phenomenon in which the trees do not touch each other. The phenomenon is most prevalent among trees of the same species, but also occurs between trees of different species.
wooN7 TIL that if a juror believes the law is unjust, they have to right to find a defendant "Not Guilty" regardless of the evidence.
mxNNv TIL that an anonymous biologist managed to get a fake scientific research paper accepted into four supposedly peer-reviewed science journals, to expose the problem of predatory journals. He based the paper on a notoriously bad Star Trek episode where characters turned into weird amphibian-people.