math_fact: 9985 is the number of hyperbolic knots with 13 crossings.
trivia: 9985 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: May 3rd is the day in 1957 that Walter O'Malley, the owner of the Brooklyn Dodgers, agrees to move the team from Brooklyn, New York, to Los Angeles, California.