Photo: David Sanborn, San Joaquin Delta at West Valley (Some rights reserved)
Wikipedia: Water polo is a competitive team sport played in water between two teams. The game consists of four quarters in which the two teams attempt to score goals by throwing the ball into the opposing team’s goal. The team with the most goals at the end of the game wins the match. Each team is made up of six field players and one goalkeeper. Excluding the goalkeeper, players participate in both offensive and defensive roles. Water polo is typically played in an all-deep pool so that players cannot touch the bottom.