Fatto matematico: 9929 is the number of 3×3 sliding puzzle positions that require exactly 26 moves to solve starting with the hole on a side.
Trivia: 9929 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: March 8th is the day in 1999 that the Supreme Court of the United States upholds the murder convictions of Timothy McVeigh for the Oklahoma City bombing.