general_fact: 2684 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 2684 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 2684 is an unremarkable number.
historical_date: May 7th is the day in 1429 that Joan of Arc ends the Siege of Orléans, pulling an arrow from her own shoulder and returning, wounded, to lead the final charge.