math_fact: 9171 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 9171 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: February 8th is the day in 1971 that South Vietnamese ground troops launch an incursion into Laos to try to cut off the Ho Chi Minh trail and stop communist infiltration.