math_fact: 87178 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 87178 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: September 7th is the day in 1906 that Alberto Santos-Dumont flies his 14-bis aircraft at Bagatelle, France for the first time successfully.