Why not create an electric drive that can be attached to any manual wheelchair, creating a long distance alternative for wheelchair users. The drive will resemble a pair of headphones, with two circular hubs connected by a curved section. Each hub will contain a 24-volt motor powered by a lithium-ion battery with a range of almost 20 miles. When attached to the center of the wheelchair's wheels, the device will be able to propel the wheelchair at speeds up to 12 mph. Steering...