Drawing from their podcast Wow in the World, Mindy Thomas and Guy Raz take a hilarious, fact-filled journey through a variety of scientific topics. Along the way, they answer the meaningful questions that readers 8 to 12 (and many of us adults) haven't dared to ask, and they include jokes, photos, quizzes, and Wow-To experiments.

Why in the world do I have a belly button? Will my nose ever stop growing? The human body is a fascinating piece of machinery, and we all have one. From head to toe, this fun guide clears up the mysteries of our walking, talking, barfing, breathing, pooping body.