Our guest on ST Medical Monday is Bret Stetka, an editorial director at Medscape.com, which is the professional division of WebMD.com. A non-practicing physician and active freelance health/science journalist, Stetka joins us to discuss his fascinating new book, "A History of the Human Brain: From the Sea Sponge to CRISPR, How Our Brain Evolved." It's a readable and engaging history of how our most mysterious organ developed over time...from the brain's improbable and watery beginnings to the super-complex marvel that's found within the head of Homo sapiens today. As was noted of this work by Psychology Today: "Crack open this book and take a read. You will be transported, illuminated, and delighted."