general_fact: 9404 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 9404 is an uninteresting number.
trivia: 9404 is an unremarkable number.
historical_date: September 29th is the day in 2007 that Calder Hall, the world's first commercial nuclear power station, is demolished in a controlled explosion.