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TIL The pilot that dropped the Tsar Bomba nuclear bomb was given a 50% chance of survival that mission, given the speed and size of the blast and whether his plane could escape in time

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via reddit.com

ejYL TIL that Labrador Retriever service dog pulled his disabled owner into the recovery position after he was struck unconscious, then covered him with a blanket. Retrieved his mobile phone and pushed it against his face, and only left his owner to fetch help once he had regained consciousness.
d8Zjd TIL King Gillette, who founded Gillette razors, believed that everyone in the US should live in a giant city called Metropolis powered by Niagara Falls.
W7JlA TIL that male ducks grow new penises each year during the mating season. Their penis size is influenced by social environment. In research studies, the ducks housed in co-ed environment grew longer penises than those housed in pairs, likely because the ducks in groups were competing for mates.
JYmO8 TIL of TV Pickup in England which refers to a phenomenon that affects electricity generation and transmission networks. It happens a lot during "Tea Time" where folks start their electric kettles all at once.
XEQD6 TIL that the abbreviation RIP originally comes from the Latin phrase “Requiescat In Pace” and not “Rest in Peace”