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Imagine a tiny snake robot crawling through your body, helping a surgeon identify diseases and perform operations.

It's not science fiction. Scientists and doctors are using the creeping metallic tools to perform surgery on hearts, prostate cancer, and other diseased organs. The snakebots carry tiny cameras, scissors and forceps, and even more advanced sensors are in the works. For now, they're powered by tethers that humans control.

But experts say the day is coming when some robots will roam the body on their own.

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