Why are MLB players wearing No. 42 jerseys today?

Cincinnati Reds on X: Let's take a look at the 2018 holiday and special event #RedsThreads! We'll start with Jackie Robinson Day on April 15 vs. STL, the 71st anniversary of Robinson

42 Things You Need to Know About Jackie Robinson, News, Scores, Highlights, Stats, and Rumors

Teams across MLB honor Jackie Robinson's 'eternal' impact

Behind the numbers -- Stories of how MLB players picked their uniform - ESPN

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

A's, Astros walk off field in protest, game postponed

MLB to Celebrate Jackie Robinson Day Friday

WATCH: America's Sporting Shame - the story of the impact of Negro leagues on baseball, Baseball News

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

Mariano Rivera Wearing Jackie Robinson's 42 to the End - The New York Times

Jackie Robinson Day 2023: MLB players wear No. 42 to honor trailblazer

Jackie's rights

The only day MLB players can wear No. 42? Jackie Robinson Day

No. 42 jersey tribute began in 2007 with Griffey