Meet Sound they're a form of energy that we can hear! Sound is here to explain where they come from and how humans can hear. Readers will learn about sound waves, the anatomy of the ear, echo, and why sounds are high or low. They'll meet scientists Griffin and Galambos and learn about their discovery of echolocation. Extend the learning with fun facts in the Can You Believe It? section of the text or define tricky words in the glossary. For more information about the science that powers our lives, check out other titles in the Building Blocks of Physical Science series!