Softcover
Rigsby offers green fun galore, showing how to build a water drop generator, a solar-powered seesaw, a windmill, and a human-powered desk lamp, while investigating the properties of solar cells, radiometers and heat engines. SC. 224pp. 2010.
Mem. Ed. $13.99
Pub. Ed. $16.95
You pay $1.99
Softcover
Rigsby offers instructions for creating a Mona Lisa that smiles wider as you approach it; a talking alarm and greeting card; an electric car toy; a no-battery flashlight that can be charged in minutes; and more. SC. 160pp. 2009.
Mem. Ed. $6.99
Pub. Ed. $16.95
You pay $1.99