Undated handout photo issued by Harvard University of a close up of a Kilobot swarm, obedient miniature robots that act together as a “swarm” to form a 1,000-strong army, scientists in the US created the soldier-like devices, each measuring a few centimetres across, to demonstrate how simple machines can display complex self-organising behaviour. (Photo by Michael Rubenstein/PA Wire/Harvard University)
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