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They turned an electroactive polymer into an actuator so that the material could change to exert force with an electrical signal, basically creating an exomuscle.
FORBES: Nanotech On The Front Lines
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The connective cells, known as fibroblasts, are then isolated and an electrical current is used to force-feed them with the snippets of DNA that make factor VIII.
BBC: Genetics work eases haemophilia
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The hogu sensors convert the force of a blow into an electrical signal, which is then sent to a laptop base station.
CNN: High-tech blow for martial arts