math_fact: 9110 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 9110 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: December 9th is the day in 1911 that a mine explosion near Briceville, Tennessee, kills 84 miners in spite of rescue efforts led by the United States Bureau of Mines.