With exiting new developments in stem cell research hitting the media, we thought it would be a great time to revisit the science behind the controversy. Is stem cell therapy really the panacea it's advocates claim it to be? How is an embryonic stem cell different from an adult stem cell and is experimentation on embryos really necessary? For this RD extra, Dr. Greg Forbes gives us an overview of the current state of stem cell research. *The doubtcasters want to thank loyal RD fans for their patience during our recent unannounced hiatus. Look for regular shows to resume within the next week.