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A study last year from the Massachusetts Institute of Technology found that plants generate a voltage of up to 200 millivolts when one electrode is placed in a plant and the other in the surrounding soil. Those researchers have since started a company developing forest sensors that exploit this new power source. A team of researchers at the University of Washington (UW) sought to further academic research in the field of tree power by building circuits to run off that energy. They successfully ran a circuit entirely off of tree power for the first time.
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