general_fact: 1525 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 1525 is a value of n for which s(f(n)) = 2s(n).
trivia: 1525 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: March 4th is the day in 1814 that Americans defeat the British at the Battle of Longwoods between London, Ontario and Thamesville, near present-day Wardsville, Ontario.