Learn about energy sources and how to "think green". Build over 125 projects using the flexibility of our award winning Snap Circuits, to have loads of fun learning about environmentally-friendly energy and how the electricity in a home works. Includes 100 page manual. This educational manual will explain all the forms of environmentally-friendly energy including: geothermal, hydrogen fuel cells, wind, solar, tidal, hydro, and others. Grades 3+.