A liquid crystal is a substance that flows like a liquid but maintains some of the ordered structure characteristic of crystals. Under certain circumstances, phases, liquid crystals have a liquid-like behaviour and during others they have the opposite behaviour.
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The 1991 Nobel Prize in Physics was awarded for showing how simple analogies can be used to understand more complex systems such as liquid crystals and polymers (plastics), which behave like solids and liquids at the same time.
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