A rainbow is just one example of light in action. Light is a fundamental component of life on Earth, but how does it work? Light is unique in physical science because it doesn't completely conform to either a wave model nor a particle model. Readers will discover that light is a form of energy and they'll learn aspects of light such as reflection and refraction. This challenging physical science concept is made easier to understand by age-appropriate language and real-life examples, such as the science behind photography and eyeglasses.