Fait mathématique: 1999 is the smallest number whose digits add to 28.
Culture générale: 1999 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: June 21st is the day in 1877 that the Molly Maguires, ten Irish immigrants convicted of murder, are hanged at the Schuylkill County and Carbon County, Pennsylvania prisons.