general_fact: 555 is the number of seats of the airliner A380-800.
math_fact: 555 is an uninteresting number.
trivia: 555 is the number of keyboard sonatas written by Domenico Scarlatti, according to the catalog by Ralph Kirkpatrick.
historical_date: July 8th is the day in 1896 that William Jennings Bryan delivers his Cross of Gold speech advocating bimetalism at the 1896 Democratic National Convention in Chicago.