Mathematical fact: 964 is the number of 3×3 sliding puzzle positions that require exactly 12 moves to solve starting with the hole in the center.
Trivia: 964 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Historical date: August 21st is the day in 1969 that an Australian, Michael Dennis Rohan, sets the Al-Aqsa Mosque on fire, a major catalyst of the formation of the Organisation of Islamic Cooperation.