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TIL that H1N1, the influenza strain that caused the 1918 flu pandemic, survived another 40+ years as a seasonal flu bug. It was finally “extinguished” by another flu virus, H2N2, in the 1957 flu pandemic. Even so, a “new” H1N1 emerged 50 years later to cause the 2009 “swine flu” pandemic.

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L88d TIL Billiards is called “Pool” because of horse race poolrooms. In the 1800s betting parlors were called poolrooms, “pool” referring to a collective bet. Billiard tables were installed in poolrooms for people to pass time between races. Eventually the phrase “shooting pool” meant playing billiards.
PYk5J TIL Edward Doisy received the Nobel in Medicine for discovery of vitamin K with Henrik Dam. He also competed with Adolf Butenandt in the discovery of estrone in 1930. They discovered the substance independently, but only Butenandt was awarded the Chemistry Nobel
6E69Y TIL that the tornado in 'The Wizard of Oz' is just a 35 foot stocking blown by artificial wind and dirt held up by a "gantry" on a set - the gantry cost more than the whole anticipated budget for the entire scene; $218,347.23 in todays money.
ned9P TIL The oldest recorded marriage in the USA is from 1565, between a Spaniard and a free black woman.
gKeX TIL there was an experiment where 2 groups of 11-12 yr old boys were given separate camps in a state park. When the groups became aware of each other they began raiding each other’s camps, which led to physical combat. The investigators ended the experiment for fear someone would get seriously hurt.