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xv It is a pleasure to thank the Editorial Staff at Elsevier for professional and courteous guidance. Natalie Farra, Acquisitions Editor, piloted the initial launch of this project, and Kathy Padilla, Editorial Project Manager, expertly steered us through all the twists and shoals along the way. The cover design was skillfully montaged by Mark Rogers. The central image, of Ariadne’s labyrinth, is reproduced with gracious permission of Erwin Reißmann (www.mymaze.de). Many thanks also to the students, postdocs, and colleagues over the years who have joined in the work repre- sented by these 18 chapters, and without whose dedication and enthusiasm, little of this would have been possible. Acknowledgments http://www.mymaze.de Acknowledgments