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After users submit a story, image or video to Digg, the site asks users to review similar submissions and make sure the new item isn't a duplicate of an existing article being voted for on the site. The tool is a marvel of modern precision. For example, notice how, in this accompanying screen shot, Digg's algorithm pairs a story on USB 3.0 with one on how "Men Aren't Washing Their Hands in The Restroom." Admit it. As a mere human, you never would have made the connection. Click to expand the image.