Would-be superheros have a cause for celebration, as the ability to walk up walls just got a little closer. Researchers have developed a nanotech superglue modeled on the minute structures on gecko feet that allow the lizards to scamper up sheer surfaces. They say the new glue is three times stronger than previous gecko-inspired glues, and ten times stickier than the lizards themselves. The gecko owes its gravity-defying capacity to tiny structures that make use of the atomic-scale attractive van der Waals force.