Small robots can't move by themselves but slide when they team up | New Scientist - https://www.newscientist.com/article/2325768-small-robots-cant-move-by-themselves-but-slide-when-they-team-up/

Little robots shaped like staples called “smarticles” can’t move around on their own, but researchers have now found that they can randomly form structures with other robots to move about


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