I found this video clip off of the discovery channel website...it was pretty interseting learning about how the eyes of the human body function. The scenerio deals with the beach and how lifeguards train their eyes to spot a person in help and not mistaken it for someone having fun.
Link to the video: http://dsc.discovery.com/video/player.html?playerId=203711706&categoryId=1425100514&lineupId=1427306027&titleId=1428688705
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