With their guest Andy Norman, Bob and Julia discuss the idea of applying biomedical concepts such as infection, immunity, and inoculation to what happens when humans are exposed to invasive false, misleading and harmful ideas and beliefs. Andy Norman is the author of the recent book: Mental Immunity: Infectious Ideas, Mind-Parasites, and the Search for a Better Way to Think and the founder of CIRCE, The Cognitive Immunology Research Collaborative.