Two different metals, usually copper and zinc, and inserted into the soil, the use of the electrolyte in the soil constitutes a primary battery. Two metal pole will produce about one volt potential difference.

Dutch designer Marieke is this simple principle design of several small works by a force of nature, have a look!

First, is this light, dozens of copper and zinc electrodes inserted in the soil constitutes its energy, as long as you keep watering, LED bulbs will illuminate you.
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