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TIL of the "Hydraulic Empire" theory. It states that civilizations developing in areas with low abundance of water are fated to develop regulating systems and ultimately despotism, and that Europe developed republicanism due to a large excess of it.

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woknE TIL: Moray eel is the only known vertebrae to use its second set of jaws to both restrain and transport prey.
m15NO TIL the post office allows cremated human remains to be mailed by priority mail, and in some cases internationally, with a special label. They also have a specification publication on how to pack the box.
R7yAl TIL 39th richest person in the world is Li Ka-Shing (!) with $28.9B net worth.
neEPr TIL female psychopaths appear to be more prone to promiscuity than male psychopaths, and while they.prefer to date non-psychopathic men in the short-term, for long-term relationships they tend to look for a fellow psychopath.
bXr4 TIL in 1960, Singapore’s birth rate was 5.4, so the government introduced a policy to stop parents from having more than 2 kids. The fertility rate dropped to 1.44, below replacement rates so the government reversed its policy. The fertility rate has never restored back to replacement levels since