Why settle for a robot that can just roll or fly? That's the question some researchers from the University of Minnesota's Center for Distributed Robotics recently asked themselves, and this little transforming contraption is their answer. As you can see in the video above, it's able to roll around on the ground with relative ease (although obstacles may be another matter), and then prop itself up to take flight like any other robotic helicopter. Those thinking about trying their hand at a DIY version may want to think twice, however, as its not exactly as simple as it may appear. In fact, the researchers apparently spent a full $20,000 just to develop the folding rotor mechanism.