Caracol one handed keyboard concept, its a computer keyboard that absolutely rubbishes all convention and takes to an entirely new approach to simplify typing. You can type blindingly fast and all that just with one hand. For this, Caracol, uses a rotary keyboard on a wheel through which you slip your palm.

The keyboard or rather, keywheel rests on a nice and comfortable, ergonomic pad very similar to the mousepad on which you rest the heel of your palm. The loop has a 5:1 gearbox which enables it to rotate even with a small movement of the palm.

Via: Cool Gadgets