Supersolid

A supersolid is a state of matter that exhibits properties of both solids and superfluids. In a supersolid, the material has a crystalline structure, which is characteristic of solids, but it also exhibits superfluid-like behavior, such as the ability to flow without viscosity. This fascinating phase of matter combines the rigidity of a solid with the frictionless flow of a superfluid, allowing it to display unique and counterintuitive characteristics.