$31 - $50

Watch the Rugged Terrain Rover Robot climb over all sorts of obstacles - nothing will stand in its way! It has over 100 dynamic variables available...

This clever hybrid crab crawls along on solar power when the sun is shining.  It can also be powered by battery when there is no sunlight. Build yo...

Cars, or automobiles, are probably the most common way for transporting humans and goods. They may vary in size and design, but all are defined as ...