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 Préhistoire, she is also director of a book series entitled 'Le passé recomposé' at CNRS Editions. Frederick L. Coolidge is Professor of Psychology at the University of Colorado, Colorado Springs. He has published extensively in behavioral genetics, neuropsychology, psychopathology assessment, and cognitive archaeology, with recent articles in the Cambridge Archaeological Journal, the Journal of Human Evolution, and the 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 (2002).