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TIL that the plagues of the Middle Ages have made around 10% of Europeans resistant to HIV. These individuals carry a genetic mutation (known as CCR5-Ä32) that prevents the virus from entering the cells of the immune system. The plagues of the Middle Ages played a part in creating these mutations.

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jNO9X TIL. Spain fought the longest and most expensive war of their conquest of modern day Mexico against the Chchimecas. They ultimately gave up and negotiated peace, ensuring the preservation of their culture into modern times and becoming one of the few pre-Columbian culures to fully survive
X0rPR TIL that boxer Lennox Lewis was behind on points to opponent Vitali Klitschko’s, until landing a punch that forced the fight to end on injury (despite Vitali wanting to continue). Lewis the winner, would then retire from boxing, whilst Vitali continually demanded a rematch over the years.
m1nLR TIL 1816 was the "Year Without a Summer," due to very low temperatures. People believed the Sun was about to extinguish as large Sunspots were visible on it's surface, spreading doomsday panic. In actuality, the cause was due to Mt Tambora, the largest volcanic eruption in human history.
GA7RG TIL Just two weeks before the 1892 U.S. Presidential election, First Lady Caroline Harrison died. The voters were unsympathetic and Benjamin Harrison lost re-election. Their daughter Mary served out the term as First Lady.
oEWr TIL the last Attorney General to break with POTUS was Elliot Richardson, who resigned after Nixon ordered him to fire the Special Prosecutor of the Watergate scandal