general_fact: 686 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 686 is the number of partitions of 35 in which no part occurs only once.
trivia: 686 is a boring number.
historical_date: November 16th is the day in 1973 that U.S. President Richard Nixon signs the Trans-Alaska Pipeline Authorization Act into law, authorizing the construction of the Alaska Pipeline.