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TIL of a very convincing theory suggesting that declines in lead exposure and lead in gasoline among the public in the U.S. and elsewhere since the 1970s has correlated with pronounced wanes/decreases in violent crime since 1990.

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Qr4E TIL In 1959, The winner of a city council election in Sao Paulo was Cacareco, a rhino at a local zoo. Its candidacy was traced back to students who had printed up 200,000 ballots with her name, and were all legitimately cast by voters, one of whom commented: “Better to elect a rhino than an ass.”
GYP0Q TIL the Yersinia pestis bacteria is responsible for 3 plague pandemics in history. This included the Plague of Justinian in the 6th century, the Black Death in the 14th century, and the Third Pandemic in the 19th and 20th century.
gE8A TIL that the first person killed on September 11th was an Israeli special operations veteran and MIT graduate student who immediately attempted to stop the hijacking of Flight 11.
Zp0Vo TIL that the founder of Chili's restaurant chain, Larry Levine, was inspired to open a restaurant that served chili and burgers and had the friendly environment of the chili cookoffs his Father in-law hosted. His FIL was famed racing driver and performance car constructor, Carroll Shelby.
7rawL TIL the commonly-acknowledge health goal "10,000 steps a day" has no real medical merit other than walking is good for you and it's a well rounded number.