math_fact: 45637 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 45637 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: December 12th is the day in 1979 that the unrecognised state of Zimbabwe Rhodesia returns to British control and resumes using the name Southern Rhodesia.