Vaccines to protect against COVID-19 are now widely available in the United States. But, wide availability doesn’t mean wide acceptance. Vaccine hesitancy and individuals who proudly claim they are anti-vax are not new phenomena. But why, with so much availability, do people resist vaccines so aggressively? What is the psychology behind this hesitancy? Is there anything we can do to change the minds of people to follow medical advice and get vaccinated? To help us unravel these vexing questions, Under the Cortex welcomes author and psychologist Dr. Stuart Vyse.