general_fact: 2409 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 2409 is an unremarkable number.
trivia: 2409 is an uninteresting number.
historical_date: August 5th is the day in 1995 that the city of Knin, a significant Serb stronghold, is captured by Croatian forces during Operation Storm.