math_fact: 4148 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 4148 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: May 10th is the day in 1503 that Christopher Columbus visits the Cayman Islands and names them Las Tortugas after the numerous turtles there.