*Cue theme from X-Files* Well Mulder would be happy. Fox Mulder, you'll recall, was the central character of the television series X-Files, an FBI agent who believed in aliens. I don't know why but the existence of aliens has played a recurring theme in science fiction - literature, radio and movies. Go back to one of my favourites - Orson Wells' radio play "War of the Worlds". Or, coming full circle, just look at the recent television series "V". But of course these stories are all fiction, they're made up, make-believe. However, a global poll conducted recently indicates 1 in 5 people believe aliens exist and they live in our midst disguised as humans. Now 20% of people polled isn't a lot but nevertheless it's a remarkable number. Methinks somebody has been watching a little too much of the sci-fi channel. Back a few years ago, before the sci-fi channel existed, when my children were younger, I might have been a part of tha...