general_fact: 84788 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 84788 is an unremarkable number.
trivia: 84788 is an unremarkable number.
historical_date: February 21st is the day in 1804 that the first self-propelling steam locomotive makes its outing at the Pen-y-Darren Ironworks in Wales.