math_fact: 52501 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 52501 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: September 28th is the day in 1912 that the Ulster Covenant is signed by half a million Ultonians in opposition to the Third Irish Home Rule Bill.