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TIL about the polio epidemic of August 1952 in Copenhagen, Denmark. This epidemic ushered in the widespread use of positive-pressure ventilation, replacing the negative-pressure iron lung machine. It is also during this time that the concept of an intensive-care unit (ICU) was first introduced.

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Bg6XW TIL the first woman to run for President was Victoria Woodhull in 1872
kONdB TIL in 1940 the WPA and NYC Tax Department took a picture of nearly every building in the five boroughs of NYC, these were digitized by the NYC Municipal Archives in 2018, collated, and geo-tagged to create a comprehensive streetview of 1940s NYC.
BgBBe TIL an airline once put 400 squirrels through a shredder
gnVW TIL that, over time, an amount of petroleum equal to 80 Exxon Valdez oil-spills, 100 to 150 barrels/day, has naturally bubbled up through seeps into the ocean floor sediment off the coast of Santa Barbra, CA. It is still continuing as you read this.
j6PNR TIL that a series finale for the TV show Renegade was filmed, but never aired. This was because most of the episodes were standalone stories and it was felt that a "conclusion" would prevent TV series buyers from purchasing the show and airing it in syndication, often out of order like many shows.