What does every living thing on the planet depend on? Weighing nothing and zooming as fast as 186,000 miles per second? Light, of course! Told in lyrical, riddling first-person narrative, Light boasts of its essential role in life as we know it, from fueling the wheel of life to humans' celebration of it as the year turns. Back matter about the science of light and major historical discoveries enhances the book for STEM learning.