A group of 1,024 small, disc-shaped robots called Kilobots can communicate with each other and form two-dimensional shapes, according to a study published in the journal Science. "If you call collective artificial intelligence the ability of a 'collective' to start to behave as a single entity, you could call this collective artificial intelligence," said study leader Michael Rubenstein, a computer scientist at Harvard University. The inexpensive robots use infrared light to sense each other's location and move on spindly metal legs.

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