The potential uses of an invisibility sphere are a source of worry for the man who conceived the idea, Janos Perczel. Perczel was a 22-year-old undergraduate at the University of St. Andrews in Scotland when he hit upon the key concept, a transmutation technique that could render a rigid object invisible. Though it might be used by militaries to hide weapons, "my hope is that the invisible sphere would be used in more peaceful ways," Perczel says in an interview. "One of them might be shielding people from hazardous forms of radiation."
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