math_fact: 21896 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 21896 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: December 12th is the day in 1901 that Guglielmo Marconi receives the first transatlantic radio signal at Signal Hill in St John's, Newfoundland.