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TIL - They make mouthguards for athletes that change color at higher temperatures. This is so a coach can easily spot who might be at risk for heat stroke

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Bg67d TIL Celine Dion's Olympics song, 'Hymne à l'amour', was written by Edith Piaf for her lover following his death en route to meet her in New York
0w84N TIL that the “Look at Me, I’m Sandra Dee” scene in the movie Grease, which features a line about Elvis, was filmed on the same day he died.
NXXxN TIL in a study of “extreme relistening” researchers found that Bittersweet songs were listened to many more times than the other song types – on average 790 times, vs. 515 for Calm songs and 175 for Happy songs.
xGwb TIL in 1988, Dennys restaurants all over the US closed for Christmas for the very first time. As a result, they had to purchase deadbolts for all of their 1,221 stores.
lo6AK TIL Michelangelo was around 23 years old when he created the Pieta sculpture