Why are MLB players wearing No. 42 jerseys today?

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Puerto Rican Twins don No. 21 in tribute to Roberto Clemente – Twin Cities

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Jackie Robinson Day, when MLB players can wear No. 42

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Seattle Mariners players honor Jackie Robinson by wearing the number 42 on their jerseys, as they stand for the national anthem before a baseball game against the Los Angeles Angels in Anaheim

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Major League Baseball remembers No. 42 Jackie Robinson – The Denver Post

Betting On Baseball And 42 Prop Bets In Honor Of Jackie Robinson Day

All MLB Teams Wearing No. 42 In Dodger Blue On Jackie Robinson Day

After Jackie Robinson, MLB integration was halting - The Washington Post

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MLB allows more players to wear No. 21 to honor Roberto Clemente – NBC Sports Chicago