math_fact: 20532 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 20532 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: March 18th is the day in 1969 that the United States begins secretly bombing the Sihanouk Trail in Cambodia, used by communist forces to infiltrate South Vietnam.