This digital textbook covers core physical science concepts and includes interactive features, real world examples, and videos.

Light is a form of energy. We see it in many different forms all around us. It's the sunlight that pours through your bedroom window and wakes you up. Images and in-depth information on light can all be accessed in this article.

Great animations showing how sound is produced.

Kids learn about the science of light. Energy made of waves and particles called photons traveling at the top speed in the universe. What is refraction? The difference between transparent, translucent, and opaque.