math_fact: 9284 is the number of ways to place 2 non-attacking bishops on a 12×12 chessboard.
trivia: 9284 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: June 1st is the day in 1890 that the United States Census Bureau begins using Herman Hollerith's tabulating machine to count census returns.