A piece of tape can only be used a few times before the adhesion wears off and it can no longer hold two surfaces together. But researchers at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, California, are working on the ultimate system of stickiness, inspired by geckos. This article's main image shows an artist's conception of a future robot that could use its "gecko" feet to carry out, for example, ISS maintenance.