At a very early age, we learn that our ears are what we use to hear. But how does that actually work? Readers find out in this informative guide to a popular beginner science concept. As readers discover the basics of sound energy and how it travels, they develop a deeper understanding of both physics and what happens in their own body. The clear, concise text is presented alongside full-color photographs and clearly-labeled diagrams. Readers can also use the helpful glossary to expand their science vocabulary.