What is a force? How do forces make things move--or stop? How does the force of gravity affect life on Earth? Find out the answers to these questions and much more. More →

What is light and how does it help us to see? What is reflection? How does light form shadows? Find out the answers to these questions and much more. More →

What is a magnet? Why are some materials magnetic? How does a compass work? Find out the answers to these questions and much more. More →

What are materials? What are the properties of a material and how do these vary? What is the difference between natural and human-made materials? Find out the answers to these questions and much more. More →