Do it yourself

An exploration of simple machines that discusses inclined planes, wedges, screws, levers, pulleys, and wheels and axles, and includes instructions for related experiments and activities.

Experiments and activities help students learn how the human body stays fit, describing how the muscles, heart, sweat glands, and other systems work together to help people stay healthy.

Helps children learn about electricity and circuits through simple experiments demonstrating basic concepts and facts.

An exploration of simple machines that discusses inclined planes, wedges, screws, levers, pulleys, and wheels and axles, and includes instructions for related experiments and activities.

Explains why people eat, provides facts about various aspects of diet and nutrition, and features recipes designed to help readers understand what the body needs to stay healthy.

An overview of composting that defines what it is; discusses decomposers, worm farms, and other related topics; and includes a glossary and resources.

Details the processes by which electricity is produced and examines how various fossil fuels such as coal, oil, and natural gas form beneath the Earth's surface. Discusses how to save energy and preserve the Earth for the future and features numerous step-by-step activities throughout. Includes full-color photographs, a glossary, and further reading sources.

Text, photographs, illustrations, and step-by-step instructions for hands-on activities explain the rock cycle.

Explains what weather is, what causes seasonal changes, and how global warming affects weather; and includes simple weather-related projects.

Introduces children to the basic concepts of sound with step-by-step instructions for simple activities and experiments on sound sources, recording sounds, the Doppler effect, echoes, and more.