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TIL that most smoke detectors contain a small amount of Americium-241, a radioactive material that can undergo nuclear fission.

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l7Re7 TIL although Green Bay, Wisconsin is the smallest major league professional sports market in North America, the NFL's Green Bay Packers ranked as the world's 27th-most-valuable sports franchise in 2019, with a value of $2.63 billion.
0wkMy TIL that there is a statue in Russia that honors all the laboratory mice that have sacrificed their lives in order to further scientific research
b60Lp TIL: about milk in Germany, which strictly defines cows’ quality of life (description in comments)
bwQ0 TIL the melody of the American national anthem comes from a drinking song about Greek gods and sex by a British gentleman’s club
1Awd TIL on September 19, 1985, when Frank Zappa famously testified before Congress to protest the PMRC’s attempt to legislate and censor heavy metal music lyrics, Zappa compared the proposed legislation to “treating dandruff by decapitation”