Fait mathématique: 1933 is a prime factor of 111111111111111111111.
Culture générale: 1933 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: April 16th is the day in 1521 that Martin Luther's first appearance before the Diet of Worms to be examined by the Holy Roman Emperor Charles V and the other estates of the empire.