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TIL that a solid 8 hour sleep is actually unnatural to us as a species. A 4 hour sleep, waking for 1-2 hours, followed by another 4 hour sleep is how we slept for the majority of evolution. The change to a solid 8 hour sleep was originally attributed to improvements in lighting and other things.

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JYKE4 TIL the inventor of the functional component of the Magic 8-Ball was inspired by a spirit writing device used by his mother, a clairvoyant.
jE5j TIL New Mexico has the best-designed flag of any U.S. state, territory or Canadian province, according to a 2001 survey by the North American Vexillological Association. Texas came in Second Place.
5Y4rn TIL that the world's brightest cities are in northern latitudes, where the sun shines less, or in arid countries, where hot daytime sun inspires more evening activity. The current top 10: St. Petersburg, Mecca, Chelyabinsk, Kuwait City, Calgary, Edmonton, Kazan, Medina, Helsinki, Tangier
b6yN4 TIL about Salty and Roselle, two guide dogs who became heroes on 9/11. Salty guided his owner, Omar Rivera, down 70 flights in the North Tower. Roselle led Michael Hingson from the 78th floor, navigating through smoke and debris. Both dogs helped their owners reach safety.
0dGNv TIL about Fugu, a dish prepared from Pufferfish, which can be lethal to humans if toxic parts of the fish are not properly prepared. In Japan and Korea, by law, only chefs who pass a three-year training are permitted to prepare the dish. Domestic preparation occasionally leads to accidental death.