general_fact: 9984 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 9984 is the maximum number of regions space can be divided into by 32 spheres.
trivia: 9984 is an unremarkable number.
historical_date: May 2nd is the day in 1998 that the European Central Bank is founded in Brussels in order to define and execute the European Union's monetary policy.