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As I am interested in any green energy concepts, I am pleased with current developments in hybrid vehicles. I would like to see the hybrid concept grow to include several different energy sources feeding power to one electric engine. This may sound goofy, but one idea I have is to use giant rubber bands as a sort of mechanical battery that could spin a generator that would feed the electric engine of a car. The bands would run beneath the car in long plastic tubes and could be wound with something like a power drill and a system of gears. Current electric cars are handicapped by the size a chemical battery can grow and still be safe and light. This would allow more potential energy to be safely stored and improve milage. While driving, if the battery power dropped to half or so, the rubber bands would be turned on and begin to restore power. If this sounds loopy, keep in mind that a one person glider was recently made that can fly up to two kilometers using a giant rubber band. The best part is that the extra weight is relatively minimal compared to metal parts.