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Reg Morrison is the author of Australia : The Four Billion Year journey of a Continent, Australians Exposed, and The Great Australian Wilderness. A photojournalist, he lives in Sydney, Australia.
Lynn Margulis is Distinguished University Professor in the Department of Geosciences at the University of Massachusetts at Amherst. Among her many books are Origins of Life and Microcosmos : Four Billion Years of Evolution from Our Microbial Ancestors (coauthored with Dorion Sagan).