general_fact: 13843 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 13843 is an uninteresting number.
trivia: 13843 is an unremarkable number.
historical_date: November 24th is the day in 1859 that Charles Darwin publishes On the Origin of Species, the anniversary of which is sometimes called "Evolution Day".