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The Citrus STEM Time Tellers is a fantastic green energy clock than be created with the power of a lemon! All that you need is to take a lemon from your home‰۪s kitchen and begin working with the provided STEM kit and instructions to put your green energy clock together. The STEM kit includes a clock, zinc and copper plates, and wires. Stick the plates inside the lemon and connect the wires from the plates inside the lemon to the clock.