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TIL a pronghorn's pronghorns are unique in that they are made of keratin and are temporary, whereas horns are keratin but permanent and antlers are bone but are temporary

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9lvG TIL “Step on a crack…” originally ended with “and your mother will turn black.”
OoY4e TIL Panthers are not a species, Panther is just the name given to any melanistic (dark or black) big cat e.g. black jaguars.
9gyX TIL that a piece of Sir Isaac Newton’s apple tree was taken to space on a space shuttle mission to defy gravity
YpoR7 TIL Jim Henson originally wanted the Muppets to be for adults and didn't see his characters as a vehicle for children's education and family entertainment. Indeed, he first envisioned something closer to South Park rather than Sesame Street and in the 1950s they did dark comedy in commercials.
DDXg TIL that in the process of trying to catch serial killer Andrei Chikatilo, Soviet police ended up solving more than 1000 unrelated crimes, including 95 murders and 245 rapes.