math_fact: 80413 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 80413 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: February 29th is the day in 1720 that Queen Ulrika Eleonora of Sweden abdicates in favour of her husband, who becomes King Frederick I.