A conversation between two of the most inspiring contemporary science writers. Davis’ The Beautiful Cure: Harnessing Your Body’s Natural Defences describes the scientific quest to understand how the immune system works – and how it is affected by stress, sleep, age and our state of mind. Blakemore’s Inventing Ourselves: The Secret Life of the Teenage Brain won the 2018 Royal Society Insight Investment Science Book Prize. They talk to Hannah Critchlow.