math_fact: 99712 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 99712 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: December 31st is the day in 1955 that the General Motors Corporation becomes the first U.S. corporation to make over US$1 billion in a year.