Products such as TiVo allow users to time shift their TV viewing habits. Similarly, Apple’s i-Pod, like Sony’s Walkman before it, allows users to shift their music listening to any place they like. So what if, in the future, you could be in two places at the same time or physically travel backwards or forwards in time? This is pure science fiction of course, but science and technology are allowing us to literally look back and forward in time, for example to identify future genetic time-bombs inside our bodies.