Rules of the Game: For FIFA matches, the ball should have a circumference of not more than 70 cm (28 ins) and not less than 68 cm (27 ins).
As of December, 2007, FIFA has 208 member associations -which is 16 more than the United Nations.
CONCACAF, the Confederation of North, Central American and Caribbean Association Footbal, was founded in 1961 and has 40 member associations.
Substitutions were allowed for the first time in the 1970 World Cup.
Manchester City has the largest pitch of any club in the English Premier League: 116 x 77 yards.
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