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TIL the waters of Lake Michigan are crystal clear thanks to a massive infestation of zebra mussels, who inflict considerable damage to infrastructure and throw the lake's ecosystem out of balance, but also filter pollutants out of the water.

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nWXJ7 TIL a 2,200 year old tomb contained crystal cups that looks EXACTLY like what we use today.
pYE7G TIL Cincinnati Reds owner Marge Schott was annoyed after her team swept the Oakland Athletics in 4 games in the 1990 World Series because it denied her revenue from a Game 5. She refused to pay for any post-game celebration for the team and the Reds celebrated on their own with hamburgers.
LVb0 TIL there is a punctuation mark that exists for the purpose of expressing irony.
b9xJp TIL that in 2016, Congressman Peter Welch won both the Democratic and Republican primaries in his state.
Egd47 TIL that the Nazis had plans to establish a museum called "The Museum of an Extinct Race" that would showcase Jewish artifacts and culture as a testament to the eradication of Jewish people. Fortunately, the museum was never realized due to the Allied victory in World War II.