The fifth episode of the Science Series is an exploration of one of the most promising fields of science: stem cell research. The panel discusses existing successes in the use of stem cells, such as bone marrow transplants, and the hopes for future applications of both adult and embryonic stem cells, both as a way to model and study disease and a possible treatment for a variety of conditions, such as heart and blood disease, diabetes , Parkinson's, Lou Gehrig's disease, Alzheimer's, spinal cord injuries, and cancer. The uses of federal and private funding for the research are also considered. These issues are discussed by Sir Paul Nurse, president of The Rockefeller University, Doug Melton, Co-director of the Harvard Stem Cell Institute, George Daley of Children's Hospital Boston and the Harvard Stem Cell Institute, Larry Goldstein, director of the UC San Diego Stem Cell program, and Story Landis of the National Institute of Neurological Disorders and Stroke.