Placental stem cells have the potential to stop cancer and autoimmune disorders in their tracks, slow or even halt the aging process, and perhaps even tackle the next pandemic. Dr. Robert Hariri, a surgeon and stem cell entrepreneur, explains how a temporary product of pregnancy, often discarded as waste, is actually an example of evolution at its best, a veritable "nature's supermarket" for cells with amazing regenerative properties. Plus - learn how some cells are more "potent" than others.