math_fact: 6976 is the number of binary 5×5 matrices A with the property that A^{2}=0 (mod 2).
trivia: 6976 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: February 5th is the day in 1958 that a hydrogen bomb known as the Tybee Bomb is lost by the US Air Force off the coast of Savannah, Georgia, never to be recovered.