Spotting a rainbow in the sky can prompt awe and happiness, regardless of how many times someone has seen this phenomenon. Myths about rainbows and their significance have been told for thousands of years. Today, scientists know exactly why these beautiful arches appear, and the explanation is as intriguing as the legends. Readers discover how raindrops and sunlight combine to create stunning arcs of color and learn about the fascinating optical principles that make rainbows possible. Vivid full-color photographs and fascinating fact boxes deepen students' understanding of the science that creates these enchanting illusions.