A decade ago in Davos, I spoke on a panel with Dr. Aki Hintsa, an orthopedic and trauma surgeon who was coaching Formula One drivers on brain health and performance. He was also working with Dr. Tommy Wood, a neuroscientist whose new book on brain health, The Stimulated Mind , comes out this month. In the ten years since, brain health has migrated to the mainstream, jumping from the pages of academic journals like JAMA to major book releases and hugely popular podcasts. The common definition of