Scientists at the University of Pennsylvania have developed a new nano-gripper that is based upon a gecko’s foot. Gecko’s are able to climb walls because their feet are covered with tiny nanostructures that stick to all sorts of surfaces.  Think Spiderman.  These new nano-grippers were made tunable so that they might stick and release from different surfaces.  They are made of a hard plastic core and surrounded by a softer silicon rubber.  The work was supported by the National Science Foundation