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A search engine has been developed for the so-called dark web. It’s called Grams and helps people search for illegal items such as drugs and weapons on the dark or hidden internet. What's behind it? Professor Alan Woodward, cyber security expert at the University of Surrey in England first explains the difference between the dark web and the regular web. (Photo: A participant sits with a laptop computer at a computer hackers conference in Berlin. Credit: Sean Gallup/Getty Images)