What's the most powerful and complex supercomputer ever built? Give up? Here's a hint: it's the size of a softball that looks like a wrinkled gray sponge. It's mission control for the rest of the body and helps steer us through life. It's the human brain! In this fascinating, interactive book, a companion to the National Geographic Channel hit show, kids explore the parts of the brain and how it all works, discover the latest news from a neuroscientist, and tackle fun brain games.