The second edition of "Stem Cells: Scientific Facts and Fiction" provides the non-stem cell expert with an understandable review of the history, current state of affairs, and the facts and fiction surrounding the promises of stem cells. Building on the success of its award-winning preceding edition, this edition features new chapters on embryonic and iPS cells, as well as stem cells in veterinary science and medicine. It includes major revisions on cancer stem cells to incorporate new culture models, additional interviews with leaders in progenitor cells, engineered eye tissue, and xeno organs from stem cells, along with new information on "organs on chips" and adult progenitor cells. In recent decades, our understanding of stem cell biology has increased tremendously. Many types of stem cells have been discovered in tissues previously thought to be incapable of regeneration in adults, such as the heart and the brain.