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Interview subjects * Paul Chien, professor of biology, University of San Francicso. Art Furst, professor of biology, emeritus, University of San Francicso. Richard Harbison, senior scientist, Woods Hole Oceanographic Institution, Woods Hole, Mass. * Robert Klesges, director, University Prevention Center, University of Memphis, Tennessee. * Bob Wall, U.S. Department of Agriculture, Agricultural Research Service, Beltsville, MD. * denotes factchecker

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