Last year scientists were able to reprogram adult mouse stem cells so that they revert back to their embryonic form (pluripotent, rather than multipotent). Now, scientists have made the process more efficient. So far it has only been attempted in mice. Learning how to do it with adult human stem cells may take several years, but it is a promising area of research. If successful, there will no longer be a need to destroy embryos (indeed, I don’t think there is a need even now given the success of adult stem cells).