A scientist waves to Mark-Andre Duc, a partially tetraplegic patient, at Switzerland's Federal Institute of Technology in Lausanne, Switzerland, Tuesday, April 24, 2012. From the hospital 100 kilometers (62 miles) away, Duc, imagined lifting his fingers to direct a robot. Swiss scientists demonstrated with this test how a partially paralyzed person can control a robot using brain signals alone. (AP Photo/Anja Niedringhaus)