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Engineers at the Massachusetts Institute of Technology's Comprehensive Cancer Institute have created an interesting polymer film that can use water vapor to generate kinetic energy. The polymer film curls as long as it is in contact with moisture, and it reverts to extension when the surface is exposed to air and moisture is released. Therefore, this kind of polymer can be used to make robotic limb muscles or piezoelectric mechanical generators, etc. It is quite suitable for some parts that are inconvenient to use batteries.
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