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TIL in Victorian London it was theorized that diseases like Cholera (which killed tens of thousands) were spread by bad-smelling air, until a scientist named Jon Snow determined water was the culprit - he became known as the father of modern epidemiology.

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Zp964 TIL Dr. Sigmund Freud was addicted to smoking and failed to quit for good throughout a 45 years long battle that included 33 operations for cancer of the jaw, an artificial jaw replacement, and attacks of "tobacco angina" exacerbated by nicotine . He was known to smoke up to twenty cigars a day.
mx6kv TIL Tolkein popularised "dwarves" as the plural of "dwarf" to differentiate his fantasy dwarves from humans with dwarfism, for whom the correct plural was "dwarfs". The dwarf trope became so entrenched that "dwarves" is now widely recognised as the standard plural of "dwarf" even for humans
vVeK TIL “When frogs eat something bad for them, they can throw up their entire stomach. The stomach actually protrudes through their mouth and they wipe it with their right front leg.”
b6BYN TIL some prison inmates will implant pieces of dominoes under their penis skin to either increase pleasure while masturbating, or provide more girth for their partners.
69WoQ TIL that the first ever International Sporting Event was a Cricket Match between USA and Canada, played in the year 1844. The match took place at the grounds of St. George’s Cricket Club in New York City. Canada team defeated USA by 23 runs.