Why are MLB players wearing No. 42 jerseys today?

Jackie Robinson Day Museum of the City of New York

Jackie Robinson - Facts, Quotes & Stats

Now honoring No. 42: Jackie Robinson Day in Major League Baseball - Deseret News

MLB players to wear #42 Monday to honor Jackie Robinson Day

Do MLB players have to wear numbers on their uniforms? - Quora

Why every MLB player is wearing No. 42 on Monday

Jackie Robinson Day - Wikipedia

Why is today Jackie Robinson Day? The reason MLB players wear 42 & more to know about baseball's annual April 15 tribute

Baseball's Jackie Robinson Day Needs to Be More Than Just a Gesture

TIME for Kids

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

Marlins focus on youth for Jackie Robinson Day