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It's literally time for an eco-friendlier world when you mark the hours with a sleek modular clock powered by plants! The science is fascinating: Two different metals generate electrical activity and moist soil serves as a conductor. And the result is elegantly simple: No winding, batteries or outlet required! Just place potting soil and your favorite small plants in the wells, water regularly and the digital clock comes to life and accurately tracks time. Hint: For best results, choose compact plants that thrive in moist soil, such as African violets or small tropical plants.