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The ferroelectret nanogenerator [link url=https://www.nature.com/articles/ncomms15310 target=_blank]FENG[/link] has been developed at Michigan State University. It is as thin as paper, can generate energy from motion and serves as a loudspeaker or microphone. FENG could, for example, be used in cars as an extensive noise-cancelling sheet – and simultaneously serve as a mouthpiece of virtual assistants.