general_fact: 4739 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 4739 is a boring number.
trivia: 4739 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: December 21st is the day in 1999 that the Spanish Civil Guard intercepts a van loaded with 950 kg of explosives that ETA intended to use to blow up Torre Picasso in Madrid.