I thank Gavin Andrews, Michael Chmielewski, Lee Anna Clark, Cynthia Cutshall, Anthony Dale, Ron de Graaf, Bradley N. Doebbeling, Wakiza Gamez, Roman Kotov, Michael O'Hara, Jennifer Gringer Richards, Leonard J. Simms, Tim Slade, Wilma Vollebergh, and Kevin D. Wu for their help in the preparation of this manuscript.