General fact: 72 is the number of disciples of Confucius.
Mathematical fact: 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.
Historical date: March 12th is the day in 1881 that Andrew Watson makes his Scotland debut as the world's first black international football player and captain.