general_fact: 52168 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 52168 is an uninteresting number.
trivia: 52168 is a boring number.
historical_date: October 30th is the day in 1973 that the Bosporus Bridge in Istanbul, Turkey is completed, connecting the continents of Europe and Asia over the Bosporus for the first time.