Light and energy moves throughout our universe in waves. Those waves can be used to heat our food, send messages across great distances, and even learn about the distant past of our universe. Uncover the secrets of radios, lasers, telescopes, and light, and meet the great thinkers who made these discoveries possible. Extraordinary photos and real-world examples invite readers to discover the world of physics, while final comprehension questions engage them to check what they have learned.