general_fact: 2519 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 2519 is the smallest number n where either n or n+1 is divisible by the numbers from 1 to 12.
trivia: 2519 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: November 23rd is the day in 1976 that Apneist Jacques Mayol is the first man to reach a depth of 100 m undersea without breathing equipment.