The standard number of players for each side on the field at any one time in a football game. The first whole number whose elements repeat.

Eleven here is represented by the Apollo 11 landing, July 20, 1969. Imagine, the phone in your hand or pocket is more than a million times more powerful than the computers that sent that rocket and her crew to the moon and returned them safely back to earth... but somehow we still can’t figure out how to avoid rush hour traffic!