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TIL Greyhounds are universal blood donors for dogs

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GYvZg TIL 50% of the world's pigs live in China
5VmD9 TIL in 1912, an Irish physicist invented the optophone which was a device that was intended to allow blind people to hear "light". It was adapted to translate written words to sounds.
grAQb TIL that the song Old Shep (written by Red Foley and made famous by Elvis), is based on dog Foley owned as a child, that, in reality, was poisoned by a neighbor.
bk6Z TIL that during WWI and WWII the US and British Navy used Dazzle Camouflage which centered around confusion over concealment and resulted in some funky looking ships
J4g4 TIL A professinal linguist in Native American languages was asked to invent Klingon for Star Trek. He speaks Klingon, but notes that others have attained greater fluency