The word "screw" calls to mind the unassuming household connectors, but students will be interested to discover that there are many different kinds of screws, from large augers and mechanical drill presses to the lids of plastic jars! With readable text and an emphasis on practical application, this book explores the many ways that we use screws every day. The text is supplemented with clear, easy-to-understand diagrams, and illustrative photographs, while straightforward experiments involving household items will excite curiosity about this helpful, yet often overlooked, device.

Introduces six simple machines, describing how they work in more complex machinery and how they are used every day.

"Simple Machines! introduces kids to the concept of mechanical advantage and harnesses kid-power by inviting them to build machines of their own design. This book also opens eyes and minds to the diversity of machines in their lives, and sparks the imagination with challenge, humor, and achievable projects"--Publisher.

Sunlight helps a plant make its own food using photosynthesis. But do you know what happens to a plant when there is no sunlight? Or what part of a plant makes food? Let's experiment to find out! Simple step-by-step instructions help readers explore science concepts and analyze information.

Audisee® eBooks with Audio combine professional narration and text highlighting for an engaging read aloud experience! Plants have roots, stems, leaves, and sometimes flowers. Each part of a plant does a special job. But do you know what a stem does? Or how different seeds travel away from their parent plants? Let's experiment to find out! Simple step-by-step instructions help readers explore science concepts and analyze information.

How are a boat propeller, water faucet, and spiral staircase alike? How can a screw keep your soda pop from getting flat? How can a screw help you plant a tree? Why might a large wrench work better than a small one? This title shows you how different kinds of these simple machines are all around you to make your work and play easier.