Amputees can now use a prosthetic arm the same way they'd use a real one: By the power of thought. Developed by Dr. Todd Kuiken of the Rehabilitation Institute of Chicago, the "bionic arm" is connected to the brain by healthy motor nerves that used to run into the patient's missing limb. These nerves are re-routed to another area of the body, such as the chest, where the nerve impulses they carry can be picked up by electrodes in the bionic arm. When the patient decides to move her hand, the nerves that would have sent the signal to real hand send it to the prosthetic one instead. Now, Dr. Kuiken's team is working on improving the arm, using surviving sensory nerves to communicate the feeling of temperature, vibration and pressure from the bionic arm to the patient's brain.