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Our world would quite literally fall apart without adhesives. They are almost everywhere – in our buildings, in our cars and in our smartphones. But what holds them together? Listener Mitch from the USA began wondering while he was taking down some very sticky wallpaper. Presenter Marnie Chesterton finds out that the use of glues goes back at least 200,000 years, when Neanderthals used them to create new tools and weapons. She learns about the chemistry that makes superglue so strong, and whether it really is possible to fix anything with duct tape. She visits the zoo to see how the tiny gecko can stick itself to walls and support twenty times its own weight. And she hears how nanotechnologists are using adhesion at tiny scales to make the materials of the future.