general_fact: 47981 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 47981 is an unremarkable number.
trivia: 47981 is a boring number.
historical_date: May 14th is the day in 1804 that the Lewis and Clark Expedition departs from Camp Dubois and begins its historic journey by traveling up the Missouri River.