general_fact: 4890 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 4890 is a narcissistic number in base 5.
trivia: 4890 is a boring number.
historical_date: May 21st is the day in 1996 that the Trappist Martyrs of Atlas, kidnapped during the Algerian Civil War and held for two months, are found dead.