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Harry Potter never had this invisibility cloak
On Christmas in 1991, Harry Potter opened a box to find a silvery cloak that fell around him like water and made him completely invisible. It now turns out that had J.K. Rowling written Harry Potter and the Sorcerer's Stone a few years later, he might have found a quadrangular device, about two feet square, with the centre left empty, fashioned out of strips of copper and fibreglass. But this would have been a Muggle invisibility cloak, and the story of the wizarding world might have turned out very differently.
Engineers at Duke University announced last week that they had perfected a "full-parameter, uni-directional" invisibility cloak. It means that an object viewed from a certain angle can be made to vanish into thin air. The device splits light striking the object into two waves, which then travel around the object and emerge on the other side as a single wave, giving the impression that the light had passed through empty space. While Harry's cloak was made out of magical substances, engineers have used intricate "meta-materials" — man-made substances that have properties natural ones don't. If the wizarding world has imperfect invisibility cloaks that stop working when the charm wears off, the 2006 model of the Duke University cloak had its flaws too. Reflections from the surface of the device made it partially visible. The new model, like Harry's cloak, is perfectly invisible, at least when viewed from the right angle.