Rules of the Game: The referee alone is authorized to allow an injured player to re-enter the field, whether the ball is in play or not.
Rules of the Game: A goalkeeper must wear colors that distinguish him or her from the other players, the referee and the assistant referees.
Rules of the Game: For FIFA matches, the ball should weigh not more than 450 g (16 oz) and not less than 410 g (14 oz) at the start of the match.
Mexico's most famous stadium, Estadio Azteca, has an official seating capacity of 114,465.
London's new Wembley Stadium contains 2618 toilets, more than any other building in the world.
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