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Shape memory materials are fascinating materials that have unique features like the ability to change shape and properties. From an engineering point of view, it allows for all type of unique applications that seem almost unbelievable. Instead of mechanical joints and connectors you can have a machine that can change its shape and produce quite large forces in the process. Right now shape memory alloys are the most common of these materials, but with time it is expected that there will be shape memory polymers and plastics. I have found the study of these materials fascinating.