A steely group of researchers at UK's Warwick University have been hard at work on a truly unique eco-friendly racecar.  The Formula 3 car is, “powered by chocolate, steered by carrots," according to its builders. Making a stab at a green car, the team of researchers has used chocolate waste and vegetable oil on the biodiesel engine, and carrot fibers make up the steering wheel, not to mention the plant oil lubricants and the flax fiber...