Fait mathématique: 8599 is the number of forests with 14 vertices.
Culture générale: 8599 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: July 17th is the day in 1938 that Douglas Corrigan takes off from Brooklyn to fly the "wrong way" to Ireland and becomes known as "Wrong Way" Corrigan.