Dr. Jim al-Khalili is a theoretical physicist and senior lecturer in the Department of Physics at the University of Surrey. He has twice been nominated for the Royal Society's Michael Faraday Award for the Public Understanding of Science and is the Institute of Physics Schools and Colleges lecturer. He is the author of "Black Holes, Wormholes and Time Machines "and has appeared on Radio 4's "Leading Edge" and the BBC's "Tomorrow's World" and "Horizon" programs.