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Carlos I. Calle is a senior research physicist at NASA Kennedy Space Center. He received NASA's Spaceflight Awareness Award in 2003 for his contribution to the space program. Dr Calle is the author of Superstrings and Other Things: A Guide to Physics and Einstein for Dummies.Sir Roger Penrose, Emeritus Professor of Mathematics at the University of Oxford, is renowned for his work in general relativity and cosmology. His books include The Emperor's New Mind and The Road to Reality.