This colorful follow-up to The Secret Life of Boogers offers a wide-ranging look at the science behind boo-boos and how our bodies heal. All the practical and fun facts you need to know about boo-boos alongside a fresh, fun art style. Why do bruises change color? What should you do if you skin your knee? And what exactly is blood anyway? The second book in the Secret Life of. series, The Secret Life of Boo-Boos is full of delightfully gross and informative facts about cuts, scrapes, burns, bumps, and bruises. Young readers will learn about how our bodies heal boo-boos, how to prevent boo-boos, and even basic first aid tips for their own boo-boos.