Introduction Meet Bobo, a curious little character with big, wondering eyes. Like all of us, Bobo lives in a world bathed in light—but does he truly understand it? Join Bobo as he flips the switch on his imagination and embarks on a glowing adventure to uncover the secrets of the brightest force in our universe.

Bobo starts his day watching a sunrise. “Where does all this light come from?” he wonders. He learns that light is a form of energy, racing toward us at 299,792 kilometers per second. From the fiery heart of the sun to the gentle flicker of a candle, Bobo discovers that light is always on the move.

Why is an apple red? Why is the sky blue? Bobo discovers that what we call “white” light is actually a party of colors: red, orange, yellow, green, blue, indigo, and violet. Using a prism, he splits sunlight into a rainbow. He now understands that the color of an object depends on which wavelengths of light it reflects back to our eyes.