math_fact: 18419 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 18419 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: June 5th is the day in 1975 that the United Kingdom holds its first country-wide referendum, on remaining in the European Economic Community (EEC).