Fatto generale: 72 is the standard resolution of an Apple Macintosh screen in dots per inch.
Fatto matematico: 72 is the sum of four consecutive primes (13 + 17 + 19 + 23), as well as the sum of six consecutive primes (5 + 7 + 11 + 13 + 17 + 19).
Trivia: 72 is the number of the Immortals of Taoism.
Data storica: March 12th is the day in 1689 that the Williamite War in Ireland begins.