Without sound there would be no chatting, laughing, bird song, or listening to music. But what exactly is sound and how do our ears and brain ensure that we get to enjoy it? In this fascinating title, the subject of sound is carefully explained in an accessible way with lots of diagrams and activities that help readers understand the science behind this topic. What are sound waves? What makes sounds louder and quieter? What are decibels? Why are some sounds high pitched and others low pitched? And how do sounds travel differently through the air, through water, and through solids? Discover how the different external and internal parts of our ears capture sound waves and working in partnership with our brains turn them into sounds. Learn how animals such as cats, bats, and dolphins use sounds that humans cannot hear to hunt. Understand how some people have hearing loss and how equipment can be used to help them hear. And meet two incredible professional musicians who make music even though they are both profoundly deaf.