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Envrionmentally friendly power sources will definitely ignite children's interests in science. Green science kits demonstrate the basic principles of electricity and mechanics in a safe, fun and imaginative way.What! No batteries!! Be a scientist as you discover how to power this digital clock using potatoes. Experiment to find out what other substances will power the clock - you'll be amazed! Contains digital clock with wires, pots, connecting wire, transparent tapes, copper and zinc strips and detailed instructions.Suitable for children age 8 years and over.CAUTION: High Voltage Inspiration and Fun!