SO MUCH in science fiction has become science fact, from space travel and satellites to robots and the mobile phone. But there are a few recurring fictional themes that still elude science: time travel, teleportation and invisibility are the top three. If the laws of physics allow, they will be the ultimate in disruptive technologies. The mobile phone means you don't have to set a time and place to meet your mate for a drink in advance anymore -just text on the night. And the Internet gives you some funny videos to watch at lunchtime and might make your Christmas shopping easier. But think what it would mean if you could instantly pop over the other side of the world, or go back in time to meet your parents as teenagers. Or, in the case of invisibility, observe unobserved anything you wanted - even your partner discussing you with his or her friends.
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