"Presents the basic principles of gravity, a history of how the theory was developed, the revisions made by Albert Einstein, and descriptions of how gravity works in space, with examples from America's space program"--OCLC.
"Have you ever wondered how the human brain works? What about your television? It's a complicated answer, but circuits are a simple way to explain it. Circuits make it possible to turn on a light. They make it possible for you to use your digital devices. Increase your knowledge about circuits and find the answers to your most electrifying questions"--Provided by publisher.
"Forces are part of our everyday lives. And knowing how they work makes us all more powerful! Balanced forces will keep you upright on your bike. Unbalanced forces will help you ride your bike as fast as the wind. Balanced and unbalanced forces play a part in all that we do"--Provided by publisher.
"When you ride a bike, what makes you stop? Friction. There are different types of friction that help us do things. Even your fingertips use friction to help you can hold things!"--Provided by publisher.
