Referee Smartwatches and High-Speed Cameras to Keep the World Cup Honest

Netherlands' goalkeeper failed to make a save from Argentina's forward and captain Lionel Messi during a penalty shoot out following extra-time in the semi-final football match between Netherlands and Argentina of the FIFA World Cup in Sao Paulo on July 9, 2014. Photographer: Fabrice Coffrini/AFP via Getty Images

At this year's FIFA World Cup, referees' wristwatches don't just tell time. They also buzz when a goal is scored.

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