Karl Friston is a cognitive scientist and one of the pioneers of modern mathematical neuroscience. He is also a Fellow at the Wellcome Trust Centre for Neuroimaging at University College London. In this episode, Lexman interviews Karl Friston about his new book, "Stopping: The Science of Prevention." In this book, Karl Friston discusses the history of stopping, how it works, and the various ways it can be used to prevent crime and injury.