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A spin ice is a substance that is similar to water ice in that it can never be completely frozen. This is because it does not have a single minimal-energy state. A spin ice has "spin" degrees of freedom (i.e. it is a magnet), with frustrated interactions which prevent it freezing. It shows low-temperature properties in particular residual entropy closely related to those of crystalline water ice. The most prominent compounds with such properties are dysprosium titanate and holmium titanate. The magnetic ordering of a spin ice resembles the positional ordering of hydrogen atoms in conventional water ice.