The Immune System: An Elegant Defense

The story of the immune system is one that began billions of years ago and is truly extraordinary. But, in the cases of cancer, rheumatoid arthritis, and HIV, misidentifications by the sophisticated system can prove deadly. Furthermore, our advancements in health and technology have often been detrimental to our defense against pathogens. Guest: Matt Richtel, author of "An Elegant Defense: The Extraordinary New Science of the Immune System: A Tale in Four Lives"