Abstract
Ionotronics An hourglass measures time by a regulated flow of sand through a narrow neck. In article number 2213677, Jianyu Li and co-workers show that with similar shapes, ionic junctions regulate ion flow, allowing unidirectional current conduction. Like sand in an hourglass, microgels can be the building blocks of such ionotronics to achieve printability and tough mechanics. The ionic junctions are critical elements in the world of soft and stretchable circuits. Cover illustration by SciFig (Mitra, Aram, and Farzan; https://sci-fig.com/).
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