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The United States team competes to win the silver in the team free routine of the synchronized swimming event at the Pan American Games in Guadalajara, Mexico, Friday, Oct. 21, 2011. (AP Photo/Silvia Izquierdo)

The United States team competes to win the silver in the team free routine of the synchronized swimming event at the Pan American Games in Guadalajara, Mexico, Friday, Oct. 21, 2011. (AP Photo/Silvia Izquierdo)

Synchronized swimming explained

From unflavored gelatin to underwater speakers to "beeping;" synchronized swimming has a specialized set of equipment and competitive framework all its own. -- By John Parker.