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TIL when Charles Darwin was sent some flowers from a friend he noticed one flower was extremely long and bet some moth with really long mouth parts exists to pollinate it. A few years later that moth was discovered.

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9YBDM TIL about the Great Stink, where after years of untreated human waste and industrial runoff in the River Thames, the smell became unbearable in London during the summer of 1858. The stench finally caused local and national authorities to address the problem—and also ended outbreaks of cholera.
1aymW TIL that British police are referred to as "Bobbies" due to the fact that Prime Minister Robert Peel founded the Metropolitan Police Force for London at Scottland Yard.
956 TIL that women become more biased against men from other races when they’re fertile.
bx7N TIL “420” did not originate as police code for marijuana use but for “juvenile disturbance”. The use of “420” for marijuana started in 1971 at San Rafael High School, where it indicated the time, 4:20 pm, when a group of students would go to smoke under the statue of Louis Pasteur
e0lJE TIL A species of Salamander called the Tiger Salamander have a unique way of controlling the population within their little society. If they sense their population has overgrown, they develop offspring with specially adapted heads and larger bodies to eat the larvae of their own species.