math_fact: 26319 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 26319 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: January 21st is the day in 1958 that the last Fokker C.X in military service, the Finnish Air Force FK-111 target tower, crashes, killing the pilot and winch-operator.