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A diaphanous plastic sheet peppered with sensors could lead to the development of medical implants so unobtrusive that people scarcely notice them, or provide “sensing skins” for prosthetic limbs or robots. So say materials scientists led by Takao Someya and Martin Kaltenbrunner at the University of Tokyo in Japan. Their plastics-based circuitry is lighter than a feather and just 1 micrometre thin. It is also so flexible and tough that an implant based on it would be all but imperceptible when worn on the back of your hand, say, or lining the roof of your mouth.
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