general_fact: 542 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 542 is a member of the Fibonacci-type sequence starting with 3 and 8.
trivia: 542 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: June 25th is the day in 1978 that the rainbow flag representing gay pride is flown for the first time in the San Francisco Gay Freedom Day Parade.