Charlene E. Makley is Associate Professor of Anthropology at Reed College.Adrian Listeris a Research Leader in Paleontology at the Natural History Museum, London, and Visiting Professor at University College London. A leading expert on mammoths, he is coeditor ofEvolution on Planet Earth.Paul Bahnis an independent archaeologist and author ofJourney to the Ice Age(UC Press), and editor ofAtlas of World ArchaeologyandCambridge Illustrated History of Archaeologyamong other books.