general_fact: 6938 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 6938 is an unremarkable number.
trivia: 6938 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: December 29th is the day in 1949 that KC2XAK of Bridgeport, Connecticut becomes the first Ultra high frequency (UHF) television station to operate a daily schedule.