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COPYRIGHTED MATERIAL Acknowledgments I would like to thank my editor, David Heath, for his astute guidance in the preparation of this book, and Charles Moomaw for his extensive technical assistance. I am grateful to Dr. Peter Moomaw for lending his scientific expertise and to artist Carol Kelley for graciously allowing her artwork to be included in this book. I greatly appreciate the participation of Andrew, Ashley, Caroline, Charlie, Emily, Max, Nancy, Peter, Sonya, Tamara, and Vivian, who appear in the photographs. COPYRIGHTED MATERIAL xi