general_fact: 777 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 777 is a repdigit in base 6 and in base 10.
trivia: 777 is a boring number.
historical_date: February 15th is the day in 1961 that Sabena Flight 548 crashes in Belgium, killing 73, including the entire United States figure skating team, several coaches and family members.