Imagine a world without light. What would it be like? Dark, cold, and lifeless In Explore Light and Optics With 25 Great Projects, readers ages 7 through 10 find out why light is so important to our world. We use light to communicate. Because of light, there are natural phenomena such as rainbows and the auroras. And it's light that provides living things with the energy they need to exist. In Explore Light and Optics , readers...