The pig looks like any other pig, only it's been wearing a backpack for a week—in the name of science. Just behind its head sits a control box, with a battery and processor, from which runs a cable that enters through the pig’s flank. Once inside, the cable attaches to a very special robot clamped onto the pig's esophagus, the pathway to the stomach. Little by little, the robot lengthens, in turn lengthening the tube. The robot attached to a segment of esophagus.Damian et al.

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