Fast-moving and ever-changing, stem cell science and research presents ongoing ethical and legal challenges in many countries. Each development and innovation throws up new challenges. This is the case even where new developments initially seem to solve old dilemmas. Sometimes it becomes evident that new science does not in fact solve old problems and, for that reason, the ethical issues remain. In recognition of this, this book presents innovative and creative analyses of a range of ethical and legal challenges raised by stem cell research and its potential and actual application. The editors.