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TIL: In 2015, HitchBOT, a cheerful hitchhiking robot which was dependent on strangers to reach its destination as an experiment, managed to travel across the Netherlands, Canada, and Germany. It was beheaded after two weeks in the US after it ventured into Philadelphia.

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p8Zve TIL of Tim Macartney-Snape, one of the first mountaineers to climb Everest without oxygen. Afterwards someone said to him "You didn't climb Everest. You only climbed the top part." So he went down to the beach in India and re-did the whole thing.
VMV94 TIL about John Snow who is considered, for his persistent efforts to determine how cholera was spread and for the statistical mapping methods he initiated, to be the father of modern epidemiology.
16xLD TIL that Paul Winchell, the guy who voiced Mr. Owl on the Tootsie Pop commercials, Tigger from Winnie the Poo, and Gargamel from the Smurfs, also invented the artificial heart.
R8BQ TIL brass doorknobs disinfect themselves in about eight hours.
Br5Kd TIL over 62,000 Swedes were sterilized as part of a national program grounded on eugenic, medical and social grounds. This program continued into the 70's.