We wish to express our gratitude and appreciation to those who have contributed to this book. The authors graciously gave of their time and expertise to make this book truly come alive, and were also very patient through the review and production process. Many reviewers and colleagues from around the world provided helpful comments and suggestions. The AU Press editors and designers -Erna Dominey, Peter Enman, Kathy Killoh and Natalie Olsen -demonstrated exceptional professionalism and creativity.Dietmar Kennepohl thanks his loving wife, Roberta, for help with redesigning some chapter figures and for her patience in listening to innumerable discussions around delivering science courses at a distance.Lawton Shaw thanks his wife, Tanya, for always being positive and encouraging about this project.