general_fact: 231 is the number of cubic inches in a U.S. liquid gallon.
math_fact: 231 is the number of partitions of 16.
trivia: 231 is the number of cubic inches in a U.S. liquid gallon.
historical_date: August 18th is the day in 1848 that Camila O'Gorman and Ladislao Gutierrez are executed on the orders of Argentine dictator Juan Manuel de Rosas.