https://www.popsci.com/science/article/2012-01/microrockets-can-zip-around-human-stomach-powered-hydrogen-bubbles/
Microrockets Can Zip Around the Human Stomach, Powered by Hydrogen Bubbles
Tiny machines that can enter our bloodstreams and do work inside of our bodies are a staple of both science fiction and real-world biomedical science, as MEMS...
zip aroundthe humanpowered by
https://bsac.berkeley.edu/publications/solid-propellant-microrockets
Solid Propellant Microrockets | Berkeley Sensor & Actuator Center
solidpropellantberkeleysensoractuator