Why are MLB players wearing No. 42 jerseys today?

Jackie Robinson - Wikipedia

Dodgers gather at Jackie Robinson statue to pay respects

It's a huge privilege' to wear Jackie Robinson's No. 42

Minnesota Twins: Top 3 Players to wear Number 42 in Team History

MLB honors Jackie Robinson Day and pays tribute to his barrier-breaking career

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

Jackie Robinson Day Celebrations for 75th Anniversary of MLB Debut

MLB celebrates timely Jackie Robinson Day

MLB: Best all-time player who wore each jersey number from 0 to 60

History of retired numbers dates back to Lou Gehrig Day

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