The dynamics of deformable systems: Study unravels mathematical mystery of cable-like structures

Are our bodies solid or liquid? We all know the convention--that solids maintain their shapes, while liquids fill the containers they're in. But often in the real world, those lines are blurred. Imagine walking on a beach. Sometimes the sand gives way under feet, deforming like a liquid, but when enough sand grains pack together, they can support weight like a solid surface.