Being able to repair internal tissue with adhesives would be incredibly useful in the medical world. As of now, those kinds of repairs are limited to sutures and staples, which are far from ideal and while external wounds can be closed with certain glues, they don't work for internal surfaces. First, the insides of our bodies are really wet -- not great for glues. And many of the strongest adhesives we have are either toxic to cells or too stiff to work on squishy, moving organs. But researchers have created a new class of adhesives that get around all of these problems, and they were inspired by slug slime.