Paul Knoepfler of the UC Davis School of Medicine has a bit of a hobby: keeping track of stem cell clinics operating in the U.S. He estimates that there are 1,000-2,000 in the U.S. alone, offering unproven treatments using adult stem cells. On the season finale of the podcast, he and Torie discuss how to balance safety and efficacy, why Health and Human Services Secretary Robert F. Kennedy Jr. is such a fan of stem cells, how the FDA can support the biotech industry, the forceful marketing of cord blood banking companies, and much more — including how to build a dragon using CRISPR.