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TIL the control of fire by early humans a million years ago changed our sleeping patterns. Exposure to artificial light during the afternoon altered humans' circadian rhythms and contributed to a longer waking day, giving us 16 hours in the waking day while most mammals are only awake for half that.

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yQGv8 TIL that in the 50's NASA recruited Deaf people to research why they didn't get motion sickness. Tests included flights in 'Vomit Comet' and sailing in the rough seas (researchers got violently sick, while Deaf people just played cards happily).
OolA7 TIL of "A Village Fair with a Church Behind": a 1643 painting by Isack van Ostade owned by Queen Elizabeth II. When conservators cleaned the painting, they discovered that a bush in the foreground had been painted over the original around 1903; they removed the bush which revealed a pooping man.
60eQ TIL that plantation owners from South Carolina paid a higher price for slaves the came from Gambia and Sierra Leon because these blacks knew how to grow rice and could show their slavemasters the process.
rRB60 TIL of Flagellant Brothers, a group of men who roamed in streets and whipped their naked bodies for atonement of their sins and called others to repent during the Black Death.
V4N0 TIL that Paul McCartney started the recording of “Hey Jude” without knowing that Ringo was absent and sitting on the toilet. Ringo tiptoed his way back into the studio just in time for the drums to come on.