DARPA's robotic arm is legendary. It's the result of years of work and a whopping $100 million, but it just might be worth it: This arm mimics the natural motion of the arm, elbow, wrist, and hand with 27 different movements (including rotation, bending, and extension) that's at the top of the field. But what's really notable about this particular arm is how it's controlled: DARPA wants to implant a small chip in the brain that would sense and measure the firing of neurons, then convey those commands to the arm, all near-instantaneously.
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