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The key is in surface moisture.

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awNn9 TIL Billionaire Howard Hughes was badly injured in a plane crash in 1946. Unsatisfied with his hospital bed, Hughes had a team of engineers design a custom bed comprised of six sections, operated by 30 electric motors with push-button adjustments- this became a prototype for the modern hospital bed.
VMkJD TIL that the Germans tried banning the Americans from using shotguns during WWI, a weapon most notably used for clearing trenches with devestating efficiency.
R7MX7 TIL that when a decapitated flatworm regrows its head, it gets all its old memories back too.
xMZ5 TIL that in Feudal Japan, there was an untouchable caste comprised of “impure” professions such as executioners, undertakers, workers in slaughterhouses, butchers or tanners. 400 years later, descendants of this caste may still face discrimination.
YP8d TIL September 19th is Talk Like a Pirate Day. On this day, Krispy Kreme gives their customers a free donut to whoever talks like a pirate and a dozen free donuts to whoever wears a pirate outfit.