There are so many sources of light in our world: the sun, fire, electric lamps, flashlights, lightning, and countless more. Even some animals give off light. What makes these sources light up? This lively look at a fundamental segment of science combines a colorful comic-book design with important and accessible curricular content. Readers will be motivated to test their understanding of the topics with quiz questions and they'll appreciate the bright graphics that highlight need-to-know concepts.