Sophie A. de Beaune is professor of prehistory at Jean Moulin University Lyon 3 and researcher at CNRS in France. The author of eight books, most recently L'Homme et l'Outil: L'Invention technique durant la Prehistoire, she is also director of a book series entitled 'Le passe recompose' at CNRS Editions. Frederick L. Coolidge is professor of psychology at the University of Colorado at Colorado Springs. He has published extensively in behavioral genetics, neuropsychology, psychopathology assessment, and cognitive archaeology, with recent articles in Cambridge Archaeological Journal, the Journal of Human Evolution, and Journal of Archaeological Research, among others. Thomas Wynn is professor of anthropology at the University of Colorado, Colorado Springs. He has published extensively on the evolution of human cognition, culminating in a target article in Behavioral and Brain Sciences, published in 2002.