As medicine moves into uncharted territory, many medical breakthroughs have tremendous potential for new therapies. They bring with them, however, ethical and moral concerns. The co-authors examine the new medical technologies like cloning, reproductive medicine, and gene therapy from both a scientific and ethical point of view. The authors also discuss other issues, like new research into stem cells, spinal cord repair, and transplant medicine, that are raising new debates in the field of medicine.