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TIL an underwater icicle, AKA brinicle or "finger of death", kills everything in its path. The water freezes in an icy sheath around it & a web of ice forms that kills everything it touches, including sea urchins and starfish, by encasing it in a tube of ice.

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R7ZX9 TIL that farmers in India used to catch monkeys by putting peanuts in coconuts and walking up to them. The holes in the coconut had to be big enough to allow them to slip their hands inside and small enough so that when they grabbed the peanuts and formed a fist they couldn't take their hands out.
Kb8J TIL that there is nine different references to unicorns in the Bible.
9YPrp TIL that natural history museums use teams of beetles to clean the flesh off specimens.
kOZB4 TIL Dudley Moore was a child prodigy on the piano and organ.
e0RnD TIL coywolves that are taking over eastern north america can breed with coyotes, wolves, and dogs.