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TIL that it is mathematically possible to turn a sphere inside out without creating any creases. The proof for this was developed by Bernard Morin; a blind mathematician.

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oB6OE TIL: The Salish Wool Dog is an extinct breed of dog that was bred to produce wool that was prized among the Northwestern Salish Tribe.
4X4r5 TIL In 1922, the Bureau of Public Roads commissioned Gen. John J. Pershing to make a map for construction purposes and to highlight which roads in the U.S. were the most important in the event of war. The "Pershing Map" was the first official topographic road map of the United States.
yQ1jl TIL That the bite force of an orca is nearly 5x that of a great white
697bY TIL: Author Roald Dahl helped invent a new brain shunt that saved thousands of children after his own baby son suffered a brain injury.
dGPB TIL That having both red hair and blue eyes is the rarest combination in humans, occurring naturally in only one percent of the human population.