Visits James Thomson's laboratory at the University of Wisconsin where stem cells were first cultured to learn why this breakthrough is so important for biotechnology. Shows what stem cells are, how they are cultured, the differences between embryonic and adult stem cells, and why they offer such potential for the future of our health and welfare. Addresses both scientific and ethical issues.

This series is designed to help teachers of ecology and environmental studies by providing vivid examples of three different ecosystems. Each program illustrates general principles of ecology and also stresses what is special about a particular ecosystem.