Referee Cuneyt Cakir of Turkey marks the ground with a vanishing spray in front of Mexico's national soccer players (REUTERS/Mike Blake)
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Goal line technology and referees spraying the pitch to mark a line where defensive walls must stand are among the innovations at the World Cup in Brazil, illustrating how the game is subtly evolving.In use at a World Cup for the first time, goalline technology showed both its value and limitations Sunday when Honduran goalkeeper Noel Valladares knocked a rebound from the crossbar over the line before scrambling it clear.Defender Marcelo goes down in history as the first Brazilian to score an own goal at the World Cup.Striker Clint Dempsey became the first American to score in three successive World Cups when he struck after 30 seconds against Ghana.
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