general_fact: 5256 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 5256 is the number of labeled partially ordered sets of 4 elements.
trivia: 5256 is an uninteresting number.
historical_date: May 22nd is the day in 1816 that a mob in Littleport, Cambridgeshire, England, riots over high unemployment and rising grain costs; the rioting spreads to Ely the next day.