math_fact: 21244 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 21244 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: February 28th is the day in 1998 that First flight of RQ-4 Global Hawk, the first unmanned aerial vehicle certified to file its own flight plans and fly regularly in U.S. civilian airspace.