math_fact: 22198 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 22198 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: October 9th is the day in 2009 that First lunar impact of the Centaur and LCROSS spacecrafts as part of NASA's Lunar Precursor Robotic Program.