math_fact: 81366 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 81366 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: October 9th is the day in 1911 that an accidental bomb explosion in Hankou, Wuhan, China leads to the ultimate fall of the Qing Empire.