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TIL that the mild and much more common first stage of frostbite, the numbing and reddening of the skin, is called frostnip.

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4XDvb TIL: The fastest R/C airplanes in the world are gliders that can exceed 500MPH and 120 G's powered only by the wind.
OKea TIL In WW2, The Allies estimated German average monthly tank production using statistical analysis of their serial numbers. They were off by one.
yV5NV TIL 2010 Vancouver luge gold medallist Felix Loch had his medal melted into 2 discs and gave one to the parents of a deceased competitor who died in a practice run on the day of the opening ceremony
M7LA7 TIL that surgeons who play video games for at least 3 hours a week make 37% fewer errors and are 27% more efficient in their procedures.
KYYwE TIL in the 1800s, the country now known as Vietnam asked the Qing dynasty to change their name to "Nam Việt". The dynasty said no, and changed their name to "Việt Nam" instead.