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TIL when a liquid is close to a surface significantly hotter than its boiling point, it produces an insulating vapor layer that keeps it hovering above the hot surface. This is called the Leidenfrost effect and visible when water drops hit a hot pan and skid around instead of boiling away instantly.

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lEgr TIL L. Ron Hubbard once fought a 68 hour naval battle with two non-existent Japanese submarines after operating his vessel’s SONAR incorrectly.
b90W9 TIL: Medieval scribes would frequently scribble complaints in the margins of books as they copied them, as their work was so tedious. Recorded complaints range from “As the harbor is welcome to the sailor, so is the last line to the scribe.”, to “Oh, my hand.” and, "A curse on thee, O pen!"
VB0y8 TIL Seahorses are notoriously bad swimmers, so much so that the dwarf seahorse is considered the slowest fish in the world.
Zlma TIL that Google founded Calico, an anti-ageing company designed to ultimately cure death
EwwX TIL in Texas, prison inmates have to pay $100 a year out of their personal account to see a doctor for a sickness that is not an emergency or a chronic illness. If they don’t have the money, half of all future funds deposited into their account are put towards the debt.