Rechargeable - describing a battery that can be refilled with electric power, Hybrid - describing something which is made by combining two or more different things , Solar energy - energy from the sun , Transparent - describing something you can see through , silicon - a chemical element found in rocks and sand and used in making glass and transistors, sunroof - a section of a car roof which you can remove to let light in, Flexible - describing something that can move and bend , Solar challenge - a competition to design and build devices powered by solar energy ,

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