Your junior scientist will love this Snap Circuits Green Energy Kit from Elenco. Your child can build more than 129 projects using more than 40 colorful Snap Circuits parts that come with this kit. Your child can experiment with solar power, windmills, hydroelectric power, rechargeable batteries, and liquid batteries to experience green energy-generation firsthand. The kit comes with green-energy components, like a solar cell, a hand crank, a fan, a water wheel, and a liquid holder with an electrode. The kit comes with an easy-to-read illustrated manual. It requires 4 AA batteries, sold separately.