have been unvieled on feb. 17, 2005, in washington at the national meeting of the american association for the advancement of science the robot was developed by researchers at cornell university and uses what the researchers called a ‘passive-dynamic design’ that closely mimics the way humans walk. steven collins of cornell, who is now at the university of michigan, added a tiny bit of motorized propulsion at the robot’s ankles. ‘at each step it pushes off with its back foot,’ collins said ‘this is similar to how we think people walk.’ read more via yahoo news