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TIL A fatal dose of caffeine is 113 cups of coffee, but you’d die of water poisoning first.

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WRjY TIL a white flag is not actually a sign of surrender for boats at sea. It’s just a request to communicate. Taking your flag down is the universal sign of surrender.
XEQaR TIL that Minnie Mouse's full name is actually Minerva
wLWL8 TIL of the Germanwings Flight 9525 crash, where the co-pilot deliberately crashed the plane into a mountainside after locking the captain out of the cockpit. The co-pilot had hidden the fact his doctor had been treating him for suicidal tendencies and declared him "unfit to work". 150 people died.
LrD9 TIL of John Snow who first proposed that cholera outbreaks were happening because people drank water contaminated with faeces. His claims were rejected for decades because the were “too disgusting” for the public to contemplate.
kOmae TIL that Batwoman and Batgirl were originally created as love interests for Batman and Robin respectively in order to combat allegations that the duo were lovers. Batwoman was later reintroduced as Bruce Wayne's cousin and a lesbian.