math_fact: 86535 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 86535 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: December 3rd is the day in 1904 that the Jovian moon Himalia is discovered by Charles Dillon Perrine at California's Lick Observatory.