general_fact: 67712 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 67712 is an uninteresting number.
trivia: 67712 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: May 21st is the day in 1946 that Physicist Louis Slotin is fatally irradiated in a criticality incident during an experiment with the Demon core at Los Alamos National Laboratory.