math_fact: 20863 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 20863 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: February 12th is the day in 1554 that a year after claiming the throne of England for nine days, Lady Jane Grey is beheaded for treason.