Dr. Zoeller has been a leader among researchers emphasizing the need for much stronger regulation of endocrine disruptors. He discusses the chemistry of prenatal and infant brain development and the ways in which endocrine disruptors –even in very low dosage– impact the hormones involved in development. He also addresses the tension between federal regulators and the scientific community on this issue. Guest: R. Thomas Zoeller, Ph.D. Professor Emeritus of Biology, University of Massachusetts-Amherst and Director, Laboratory of Molecular, Cellular and Developmental Endocrinology; Visiting Professor at Örebro University, Örebro, Sweden.