Last year, scientists created the first living machines by joining cells from African clawed frogs with tiny robots. One of them used sculpted cardiac cells to propel themselves along, push payloads, and even work collectively within a swarm of other "Xenobots."

And today, the same research team announced the creation of life forms capable of self-assembly into a body from a single cell, according to a new study published in the journal Science Robotics.

The Xenobots can also move more quickly, navigate varying environments, and live longer than the first models — all while working in groups and healing if and when they're damaged.

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