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TIL “Mark Twain” (meaning “Mark number two”) was a Mississippi River term: the second mark on the line that measured depth signified two fathoms, or twelve feet.

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N7mPP TIL that Screech Owls keep blind snakes as pets/housekeepers. The snakes are carried to the owl's nest, and then burrow into it and eat bugs that would otherwise pose a threat to the owl's young.
4kVpw TIL Asthma is a disease of the lower airways of the lungs that affects between 1 and 5% of cats.
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