Fait mathématique: 4422 is the maximum value of n so that there exist 5 denominations of stamps so that every postage from 1 to n can be paid for with at most 15 stamps.
Culture générale: 4422 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: February 8th is the day in 1601 that Robert Devereux, 2nd Earl of Essex, rebels against Queen Elizabeth I – the revolt is quickly crushed.