Fatto generale: 64 is the total number of black and white squares on the game board in chess or draughts.
Fatto matematico: 64 is the smallest number with 7 divisors.
Trivia: 64 is the number of Braille characters in the old 6-dot system.
Data storica: March 4th is the day in 1985 that the Food and Drug Administration approves a blood test for AIDS, used since then for screening all blood donations in the United States.