Dr. Irving Weissman, a Stanford University professor credited with isolating mammalian blood-forming stem cells, shares groundbreaking insights on hematopoiesis and cancer. He discusses innovative treatments for metastatic breast cancer and severe combined immunodeficiency. The conversation dives into myeloid bias in aging, the complexities of blood cell development, and the ethical challenges in stem cell research. Weissman also emphasizes the importance of translating scientific discoveries into effective therapies, highlighting the intersection of science, ethics, and commercialization.