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Read's agency is currently funding various pioneering approaches to robotics, some of which involve actuators made of elastomers – like rubbery plastics. Such material might be sandwiched between electrodes so that they contract or expand as voltage is applied and removed, for example. Not unlike an animal muscle.
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Plato (left) imagined humans were once whole, with four arms, four legs and two faces, before Zeus (right) split them, leaving each half searching for its other
very first implementation of the concept, the 2984 was an important step in ATM