math_fact: 1848 is the smallest value of n for which _{2n}C_{n} is divisible by n^{2}.
trivia: 1848 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: January 21st is the day in 1968 that a B-52 bomber crashes near Thule Air Base, contaminating the area after its nuclear payload ruptures.