The “gelbot” is powered by little more than temperature changes, and its innovative design, which resembles an inchworm, is one of the most promising concepts in the field of soft robotics…\

“It seems very simplistic, but this is an object moving without batteries, without wiring, without an external power supply of any kind—just on the swelling and shrinking of gel,” said David Gracias, a professor in the Department of Chemical and Biomolecular Engineering at Johns Hopkins University and a senior project leader.

“Our study shows how the manipulation of shape, dimensions, and patterning of gels can tune morphology to embody a kind of intelligence for locomotion.”

https://www.zerohedge.com/technology/scientists-develop-gelatinous-robots-crawl-through-human-body-deliver-medical-payloads