general_fact: 4723 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 4723 is the index of a prime Fibonacci number.
trivia: 4723 is a boring number.
historical_date: December 5th is the day in 1492 that Christopher Columbus becomes the first European to set foot on the island of Hispaniola, now Haiti and the Dominican Republic.