general_fact: 15383 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 15383 is an unremarkable number.
trivia: 15383 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: February 11th is the day in 1990 that Nelson Mandela is released from Victor Verster Prison outside Cape Town, South Africa after 27 years as a political prisoner.