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TIL of Exploding Head Syndrome, a sleep disorder where patients hallucinate a loud noise, such as an explosion, just as they are falling asleep. Its causes are unknown and there is no treatment.

Read more ncbi.nlm.nih.gov

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woKDJ TIL the massive decimation of native populations in the Americas in the 1500s led to vast areas of cultivated land reverting to wilderness. This reforestation in turn contributed to a period of global cooling known as the "Little Ice Age"
Y7BdA TIL that in Canada, they don't sentence criminals, like murderers, life in prison without parole as they consider it as cruel and unusual punishment
a89Bo TIL 37 year old Tiny Tim married a 17 year old on the Carson Show in front of 40 million viewers
LQMO9 TIL the 'Negro Motorist Green Book' was based on an earlier 'Jewish Vacation Guide' book which outlined places that Jews were not unwelcome to stay in America in 1917.
4X4dw SciShow Space takes you into Low Earth Orbit to explain how artificial satellites get up there and stay there -- at least for a while.