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TIL oily rags can spontaneously self-ignite because the oil reacts with oxygen in a reaction to produce heat, and a bunched up cloth can trap the heat enough to reach ignition temperatures.

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QN89k TIL: Conflict in Sudan generated that 15 million people are experiencing acute food insecurity
JZGB TIL one way the Aztecs sacrificed humans was to tie a prisoner to a stone and have him fight a team of warriors armed with obsidian-bladed clubs. The victim was allowed to defend himself with feathers.
D1ykJ TIL of a 1698 beard tax in Russia, in which authorities were authorized by Emperor Peter I to publicly shave individuals who did not pay the tax on their beards. The tax was designed to make Russian men conform to Western European notions of grooming.
R7pG1 TIL the first in the movie series for The Lord of the Rings, Shrek, The Fast and the Furious, Harry Potter, and Oceans Eleven all came out in 2001
XExwD Age-related vision loss prevented by exercise in an experimental study.