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Fibers are the basis of ropes and fabrics. With the development of advanced fibers that can act as sensors and actuators or store or harvest energy, it is possible to make fabrics with advanced functionalities. New research in Science shows that it is also possible to design fibers to pump fluids, a task otherwise left to external, bulky devices. Helical electrodes are first embedded into the walls of a tubular fiber. Then, the injection of charge using a direct current field ionizes a dielectri