A fun, doodle-filled book about how your body works by the author of Why Is Snot Green? What happens in your head during a headache? What are toes for? Why are some farts eggier than others? These and other important questions are answered in this fun, fascinating book. Packed with doodles and information about all sorts of incredible things, from scabs, cells, and broken bones to brainpower, bacteria, and deadly diseases, this book contains absolutely no boring bits!