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Made by 4M Industrial Development, Green Science Kits are part of the company's Kidz Labs series and are simple and inexpensive means of illustrating sustainable energy and environmental science. The kits, which range from water filtration to the classic potato clock, have a practical DIY feel that's reflected in their cost. Nearly all are available from Amazon for under $18.

The Windmill Generator (right) won the 2009 Teacher's Choice Award for Family. An LED mounted to the windmill generator glows as it's powered by the wind, a tangible example of how fields of turbines can produce electricity for entire communities.

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