math_fact: 10473 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 10473 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: September 2nd is the day in 1666 that the Great Fire of London breaks out and burns for three days, destroying 10,000 buildings including St Paul's Cathedral.