general_fact: 1491 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 1491 is a boring number.
trivia: 1491 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: January 30th is the day in 1982 that Richard Skrenta writes the first PC virus code, which is 400 lines long and disguised as an Apple boot program called "Elk Cloner".