William Calvin, who writes engagingly about the brain and evolution, has a new book coming out in March. He’s a theoretical neurobiologist and most recently has been thinking a lot about the role of climate in evolution (his last book was A Brain for All Seasons). The new book, A Brief History of the Mind pulls together his previous themes of cultural change, climate shifts, and physical evolution into a journey through 7 million years of human thought, and even beyond.