math_fact: 6397 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 6397 is a boring number.
historical_date: July 6th is the day in 1989 that the Israeli 405 Bus slaughter in which 14 bus passengers are killed when an Arab assaulted the bus driver as the bus is driving by the edge of a cliff.