Fait général: 1504 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 1504 is the number of anisohedral 21-iamonds.
Culture générale: 1504 is an uninteresting number.
Date historique: February 12th is the day in 1974 that Aleksandr Solzhenitsyn, winner of the Nobel Prize in literature in 1970, is exiled from the Soviet Union.