Gecko-Inspired Window Washing Robot is Powered Entirely by Water

IEEE Spectrum - Batteries and motors are heavy and inefficient in that they expend a significant percentage of their power just moving their own mass. This is especially apparent in climbing robots, which spend most of their time hoisting themselves vertically upward. Researchers from Zhejiang University in China have developed a robot that's capable of sticking to smooth surfaces, climbing vertically, and washing windows, relying almost entirely on water pressure.

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