general_fact: 509 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 509 is the index of a prime Fibonacci number.
trivia: 509 is a boring number.
historical_date: May 23rd is the day in 1813 that South American independence leader Simón Bolívar enters Mérida, leading the invasion of Venezuela, and is proclaimed El Libertador ("The Liberator").