Researchers at Johns Hopkins University have designed worm-like ‘robots’ which are made from a gel material. Parts of their bodies expand and contract during temperature changes, enabling it to move.

The research aims to eventually use similar techniques to create tiny soft robots that can autonomously deliver medicine inside patients bodies under specific circumstances.

https://3dprinting.com/news/johns-hopkins-prints-worm-like-gel-robots/
https://www.youtube.com/watch?v=PYgojk4F2Tg