math_fact: 19601 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 19601 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: August 30th is the day in 1974 that a powerful bomb explodes at the Mitsubishi Heavy Industries headquarters in Marunouchi, Tokyo, Japan.