"One day, people could monitor their own health conditions by simply picking up a pencil and drawing a bioelectronic device on their skin. In a new study, University of Missouri engineers demonstrated that the simple combination of pencils and paper could be used to create devices that might be used to monitor personal health."
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[ 2.8 ms ] story [ 9.3 ms ] threadpaywalled paper: https://www.pnas.org/content/early/2020/07/09/2008422117