This definitive reference features amazing, original, and occasionally gross facts that will keep kids captivated. Take an in-depth tour of each region of the body, and learn how it all works. Explore exploded views of body organs, systems, and processes in photorealistic 3-D. Learn how your actions and behaviors--from sports and nutrition to emotions and music--affect your body. The free digital companion book, BE A BRAINIAC, is a great brain workout, with online tricks, games, and puzzles and mind-blowing optical illusions!