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TIL of thioacetone, a chemical compound so pungent that when it was accidentally released in 1889, people started vomiting, suffered nausea and even unconsciousness up to 750 metres (0.47 miles) away.

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VKQ TIL that Emma Stone’s low-pitched husky voice is a result of having baby colic, a condition of constant screaming as an infant.
4k86X TIL Emerson Romero was a silent film actor who was deaf. When movies with sound were invented, deaf actors got less roles and the intertitle text was removed. This led him to make an early form of movie captioning in 1947 so that movies would still be accessible to deaf people.
4aaX TIL a tomato plant was found on the 40 year old volcanic island, Surtsey. Scientists were boggled as to how it got there. Turns out, it was from a scientist taking a dump, subsequently growing the plant.
d5rE TIL The the power symbol found on every power switch is actually a 1 and 0. The English words On and Off were replaced by the universal numeral symbols 1 and 0 to bypass any possible language barriers as technology became more ubiquitous.
Lk850 TIL in 1991 two English pranksters took credit for many of Britain's crop circles, after an investigator declared one example "impossible for human beings to make". After some refused to believe them, Bower and Chorley started adding straight lines and squares to show they weren't natural.