Grippy Not Sticky

Stanford engineers have developed a material modeled after a gecko's grippy fingers that adheres to surfaces but doesn't get stuck.

A material inspired by the unique physics of geckos' fingertips could allow any type of object to be gripped and let go of without applying excessive force. The engineered rubber consists of thousands of microscopic flaps. These flaps increase the surface contact area with objects through sheer force. So when the material is tugged on, the flaps exert a tremendous gripping force on an object.