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High Quality Content by WIKIPEDIA articles! A supersolid is a spatially ordered material with superfluid properties. Superfluidity is a special quantum state of matter in which a substance flows with zero viscosity. Liquid helium-4 was found by Peter Kapitza, John F. Allen, and Don Misener to exhibit this property when it is cooled below a characteristic transition temperature called the lambda point. Also superfluidity is observed when superconductors are cooled below a critical temperature. However, before the recent observation of supersolid-like behavior in solid helium-4, superfluidity was considered to only be a property of the fluid state, e.g. superconducting electron fluids, gases with Bose-Einstein condensates, or unconventional liquids such as helium-4 or helium-3 at sufficiently low temperatures.