general_fact: 4002 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 4002 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 4002 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: December 15th is the day in 1256 that Hulagu Khan captures and destroys the Hashshashin stronghold at Alamut in present-day Iran as part of the Mongol offensive on Islamic southwest Asia.