general_fact: 2650 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 2650 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 2650 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: April 3rd is the day in 1860 that the first successful United States Pony Express run from Saint Joseph, Missouri to Sacramento, California begins.