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Wheel chairs used to have to stay only on certain surfaces, but now people in wheel chairs have the opportunity to go anywhere with this new tank chair. This new wheel chair has tank treads, so it can go through water, on dirt and even through snow. It costs $20,000 if you would like your own. The Trikelet is bragging to be the world's smallest electric vehicle. It can fold up like a piece of luggage, and you can pull it on its wheels behind you. This scooter will cost about $1,400, but is still in development. MIT has brought Spiderman's Doc Ock's invention to life. They created arms that can do many things that normal arms can do including holding things up or carrying things.