The next robot crawling through your gut could be a gummi bear

Specifically, the EPFL team has developed a gelatinous actuator, the component of robots that make them move. And rather than rely on a mechanical motor or external power source, these actuators use liquids and air that react to chemicals. Each segmented actuator is roughly 4 cm in length and, as you can see in the image above, curl to one side when activated. This allows a single actuator to crawl -- inchworm-style -- through the digestive tract or, working in tandem, create a crude gripper. These actuators can also be paired with small digestible batteries, cameras and sensor equipment, all of which is already available, to create a truly edible robot.