Robert R. Provine is professor of psychology at the University of Maryland, Baltimore County. He received graduate training in psychology and studied developmental neuroscience under Viktor Hamburger and Rita Levi-Montalcini at Washington University in St. Louis. He has expanded his research on neurobehavioral development and evolution to include human laughter, yawning, language and social behavior. Address: Department of Psychology, UMBC, Baltimore, MD 21250.  Internet: provine@umbc.edu