-Source-BBC- Travelling in time might sound like a flight of fancy but some physicists think it might really be possible. BBC Horizon looked at some of the most promising ideas for turning this staple of science fiction into reality. Ron Mallett has a dream: He wants to travel in time. This isnt mere fantasy - Mallett is a respected professor of physics. I think of myself as being an ordinary person with a passion and my passion is the possibility of time travel he says. Prof Mallett has wanted to build a time machine for most of his life. His passion he explains can be traced to a tragic event early in his life. Rons father a heavy smoker died of a heart attack at the age of 33 - when Prof Mallett was just 10 years of age. Ron was devastated and withdrew into his books. A year after that when I was 11 I came across the book that changed everything for me. That was The Time Machine by HG Wells the University of Connecticut physicist told the BBCs Horizon programme.