Fait mathématique: 1584 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 1584 is an uninteresting number.
Date historique: May 2nd is the day in 1952 that the world's first ever jet airliner, the De Havilland Comet 1 makes its maiden flight, from London to Johannesburg.