Fait mathématique: 12503 is an uninteresting number.
Culture générale: 12503 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: March 25th is the day in 1965 that Civil rights activists led by Martin Luther King, Jr. successfully complete their 4-day 50-mile march from Selma to the capitol in Montgomery, Alabama.