general_fact: 49748 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 49748 is an unremarkable number.
trivia: 49748 is an uninteresting number.
historical_date: March 15th is the day in 1917 that Tsar Nicholas II of Russia abdicates the Russian throne and his brother the Grand Duke becomes Tsar.