math_fact: 91394 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 91394 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: March 24th is the day in 1882 that Robert Koch announces the discovery of mycobacterium tuberculosis, the bacterium responsible for tuberculosis.