math_fact: 4943 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 4943 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: July 13th is the day in 1985 that the Live Aid benefit concert takes place in London and Philadelphia, as well as other venues such as Sydney and Moscow.