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From Discover Technology:
Back in 2006 Harry Potter was all the rage in the engineering world. That year a team at Duke University built the first rudimentary device for hiding objects, akin to the boy wizard's invisibility cloak. But in technology as in the movies, Harry Potter is now old news. Over the past six years, scientists have moved beyond mere invisibility: If they could build cloaks for light waves, then why not design materials to conceal sound and even ocean waves?
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