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how about basic solar energy. (back in 1988, i went to the indiana state science fair for this one). i made a solar hot dog cooker out of a cereal box, and silver backed insulation board.
you're too far south to demonstrate how a black t-shirt layed on snow melts the snow faster than a white t-shirt.
or use a small solar cell to drive a model car (electric motor)?
automotive/green/investigative
any of these projects should have a question/hypothesis. the demonstrative part will work in concert with the investigative part
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-mike
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