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TIL that medieval monks inadvertently documented some of the largest volcanic eruptions in history by studying historical observations of lunar eclipses.

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jNm8X TIL of the Hatfield-McCoy family feud, one of the most famous in America. Both families were Confederates, but one of the McCoys fought for the Union. While returning home from the war, he was murdered by a Confederate militia with the prime suspect being a Hatfield.
gm5L TIL tuberculosis wiped out 50% of the males in a troop of savanna baboons after they consumed tainted meat. The more aggressive males died, leaving their less aggressive peers to create and pass down a uniquely unaggressive culture.
N7KdM TIL the great smog of London in 1952 was so bad that pedestrians couldn't even see their feet. Some of the 4,000 who died in the 5 days it lasted didn't suffer lung problems – they fell into the Thames and drowned because they could not see the river
wLyQP TIL: COVID-19 (Coronavirus Disease 19) is the disease, and is caused by a virus called SARS-CoV-2
yQ9V TIL that the U.S. Census lists prisoners as residents of the communities where they are confined. Therefore, voters who live in legislative districts with prisons, typically in rural areas, wield more political clout than other voters.