Scientists have taken the first steps towards creating a Harry Potter-style cloak of invisibility. Professor John Pendry, from Imperial College London, said that it may not take long to develop an invisible fabric - assuming there is sufficient research into the technology. "If there is adequate funding, I'd have thought it would take in the order of five years," he said. "You could build a shed out of this material and drive a tank in there, or a motor car, or hold a party inside it, and once you close the door everything it contains would be completely invisible." The...