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I made a robot called Worm. It was named as it could clear PV Panels(for now) doing works with is joint and it is slithering to clean panels. It has two heads and go to different places on panels. It has small detectors at the heads (function clean or not, daytime and night and etc). One of its features is, it can recharge itself and can act autonomously and collectively! they can work autonomously for many years ! So vote me to make this idea become real. Thanks...