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Mark Henderson is science editor of the Times (UK). He takes a particular interest in genetics and reproductive medicine, including IVF, PGD and stem cell research. He lives in London, England. Joanne Baker studied natural sciences at the University of Cambridge and did her PhD at the University of Sydney. She is a physical science editor at Science magazine. Tony Crilly he has written and edited many works on fractals, chaos and computing, and he is the author of the acclaimed biography of the English mathematician Arthur Cayley.