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TIL that in 1898 doctors began to suspect that smoking caused lung cancer, despite the fact that there were only 140 published cases of the then rare disease in 1900

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VBGlB TIL the actor/comedian Sinbad was one of the top ten worst tax debtors to the state of California in 2009, owing up to $2.5 million in income tax to the state
RYM4 Beverly Hills sits atop an oil field with nearly 100 active wells, many disguised as buildings, producing ~1 million barrels/year
mbOx TIL that Lake Kivu is one of three lakes that undergoes limnic eruptions. These sudden releases of carbon dioxide kill every human and animal around the lake. It is estimated that the lake erupts about once every thousand years. Currently, about two million people live on the shores of Lake Kivu.
R7Dk4 TIL United States currency paper is composed of 75 percent cotton and 25 percent linen. Making it not actually paper, but cloth.
aw7aZ TIL that the Apollo 11 crew Niel Armstrong, Buzz Aldrin, Michael Collins didn't add their names to the mission patch because they wanted the patch to represent everyone involved with mission