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TIL only 19 states including D.C. in the U.S. have universal motorcycle helmet laws that require all riders to wear helmets. Illinois and Iowa have no state law on the books while all other states anyone over the age of 17 to 20 depending on the state is not required to wear a helmet while riding.

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96Wp TIL in circuses, the Sousa march “The Stars and Stripes Forever” is played by bands to alert workers to a life-threatening emergency, and to expedite removing the audience. It is never a part of regular circus music programs for this reason.
GY7Dj TIL that in 1917, Ernie Shore threw a "perfect game", with 27 outs without allowing a baserunner. However, he is only credited with a combined no-hitter because he pitched in relief of the starter, Babe Ruth, who was ejected for punching the umpire after walking the first batter of the game.
W7La8 TIL that Van Halen's touring contract stated that if they found any brown M&M's backstage the band could cancel the concert at the full expense of the promotor. If brown M&M's were found it meant the promotor hadn't read every word of the contract and may have missed important safety-related items.
wpdo TIL The ‘golf ball effect’ that reduces drag on dimpled golf balls also works on a car. So putting dimples all over your car reduces drag and fuel consumption
4YB6 TIL of Airforce Cadet Matthew La Porte who was studying at Virginia Tech when the shootings took place. He barricaded the door in an attempt to protect his classmates and when the shooter broke through he charged him and was shot seven times while his classmates escaped.