general_fact: 15925 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 15925 is an unremarkable number.
trivia: 15925 is an uninteresting number.
historical_date: August 7th is the day in 1974 that Philippe Petit performs a high wire act between the twin towers of the World Trade Center 1,368 feet (417 m) in the air.