math_fact: 18295 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 18295 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: February 1st is the day in 1709 that Alexander Selkirk is rescued after being shipwrecked on a desert island, inspiring the book Robinson Crusoe by Daniel Defoe.