math_fact: 4823 is the number of triangles of any size contained in the triangle of side 26 on a triangular grid.
trivia: 4823 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: March 15th is the day in 1916 that President Woodrow Wilson sends 4,800 United States troops over the U.S.-Mexico border to pursue Pancho Villa.