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TIL animals can't make vitamin D in their skin because their fur or feathers shade it from the sun. In the oils secreted on their fur or feathers are the precursors, and after vitamin D is produced they lick it up when grooming.

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a8nWo TIL about HNoMS Pol III. With 1 cannon and 2 machine guns, this Norwegian PT boat attacked a Nazi invasion force made of 2 heavy cruisers, 1 light cruiser, 3 torpedo boats, and 8 minesweepers, rammed one of the torpedo boats, and launched flares to alert coastal defenses to the incoming invasion.
wL4e7 TIL it is possible to use electroejaculation to retrieve viable sperm from men up to 36 hours after death
W7dpY TIL that the once-ubiquitous "Mmm... Toasty!" Quiznos sandwich chain, which had 4700 locations in 2007, closed over 90% of their stores in the space of the following decade. It was the largest and fastest collapse in industry history.
YpNYW TIL spectators at the Indy 500 used to erect huge scaffolding towers for viewing until one collapsed killing 2 and injuring 82.
oj18 TIL in 1993 Egyptologists sent a small rover through one of the Air Shafts of the Great Pyramid. The rover came in contact with a stone door with two copper handles attached. To this day, the door has not been opened and now one knows where it leads