general_fact: 4312 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 4312 is the smallest number whose 10^{th} power starts with 7 identical digits.
trivia: 4312 is an uninteresting number.
historical_date: October 21st is the day in 1921 that President Warren G. Harding delivers the first speech by a sitting President against lynching in the deep south.