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TIL that in 1506 Louis II of Hungary was born prematurely and doctors kept him alive by slaying animals and wrapping him in their warm carcasses as a primitive incubator

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1Wp8 TIL that the United States government made a film during World War II that explained the uses of hemp and encouraged farmers to grow as much as possible.
OG6PL TIL about the white-throated sparrow, where male and female birds each exist in two forms: a white morph and a tan morph. Tan morphs only mate with white morphs, creating four different groups of birds that each act like a distinct 'sex' - tan males, tan females, white males and white females.
y0XX TIL a 52Hz frequency whale call from an unidentified species has been heard since the 80’s; it is thought that only one whale uses this frequency, who scientists call the “World’s Loneliest Whale.”
8a6aV TIL of a giant "WELCOME TO CLEVELAND" sign on a rooftop in the flight path of a Milwaukee airport. It has been causing confusion to passengers since 1978. Creator, Mark Gubin, said: "Living in the world is not a dress rehearsal. You better have fun with it."
R57nQ TIL of Skeuomorphs, objects designed to look like an older version of the same object. Examples include fake buckles on leather shoes, rivets on jeans, mechanical arms on slot machines, and digital apps designed to look like their analog equivalent.