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TIL of The British Doctor's Study of 40,000 doctors was a 50 year long study that was the first to provide evidence of a causal link between smoking and lung cancer.

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D1Wbv TIL that iconic scare from 2002's The Ring wasn't Amber Tamblyn in makeup, playing dead. It was actually a body double created by the now retired effects legend Rick Baker who photographed Tamblyn from multiple angles to make the figure look as convincing as possible.
YpDXv TIL Japanese airline, All Nippon Airways in an effort to save costs asked passengers to visit the lavatory before boarding because empty bladders means less weight carried.
vlQx TIL that when Genghis Khan’s eldest son Juchi died while hunting, his subordinates, fearing punishment for bringing bad news, forced a musician to do it. The musician performed a melody, Genghis Khan understood the message, and “punished” the instrument by pouring molten lead on it
adbM TIL that, after his disabled owner was struck by a car, ‘Endal’ the service dog pulled his unconscious owner into the recovery position, retrieved his mobile phone from beneath the car, fetched a blanket and covered him, and then ran to a nearby hotel to obtain help
p80Jp TIL that Ethiopia's Salt Ponds Contain One of the Few Places Life Cannot Survive on Earth: The Dallol pools are likely so hot, salty and acidic that even extremophile microbes are unable to enter.