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TIL Genghis Khan would marry off a daughter to the king of an allied nation. Then he would assign his new son-in-law to military duty in the Mongol wars, while his daughter took over the rule. Most sons-in-law died in combat, giving his daughters complete control of these nations

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deQ TIL there was a phantom island off the coast of Ireland called Hy-Brasil, which was not discounted till 1865, seven years before its last sighting.
9w50M TIL Charlotte Serber, the only female section head in the Manhattan Project, served as the head librarian, overseeing classified documents and research data. Maintaining the secrecy and security of information crucial to the development of the atomic bomb during World War II.
m1wmo TIL that The Pig War of 1859 was a territorial dispute that occurred between the United States and the United Kingdom on San Juan Island. One pig was the only casualty with the German Empire arbitrating the dispute.
78W6p TIL that the popularity of "Doer" names for Boys - like Racer, Trooper, Charger, Wrangler, etc. - rose by 1000% between 1980 and 2000, and has since largely stabilized at around 50,000 "Doer" named Boys per year.
wDVo TIL Asperger syndrome is named for Austrian pediatrician Hans Asperger, who described it in 1944. He called his patients “Little Professors.”