This article details the research of a student research project out of MIT that explored solar tracking without the use of electricity. There inspiration stemmed from heliotropic plants that track the sun by responding to differences in temperature. They used temperature sensitive materials to produce a solar tracking device that reacts to the location of heat for the sun's rays...
It requires no energy at all...
Heres the link...
A good example of whats possible with collaborative thinking from students...
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