My guest today is Simon Singh, author of many science-related books including Fermat's Enigma, and The Code Book. His latest book, Big Bang, investigates the origins of the search for our place in an ever expanding Universe. Simon speaks to me from his home in London, England. I just want to apologize in advance for the murky audio quality - that's what you get when you call London from Canada through Skype. I've got an audio transcript that you can refer to if you're have trouble making out what Simon said.