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U.S. Scientists Created The World’s Smallest Autonomous Robots (Bacteria-Sized). They Cost A Cent/Robot, & Use Ion-Driven Propulsion In Fluid (No Moving Parts) & Light For Power/Programming. Equipped With The Smallest Computer, They Sense Temp Changes, “Wiggle” To Signal, & Coordinate Like Fish. With Potential Uses For Medical/Env. Tasks.

Penn and Michigan Create World’s Smallest Programmable, Autonomous Robots | Penn Engineering

https://www.seas.upenn.edu/stories/penn-and-umich-create-worlds-smallest-programmable-autonomous-robots/

Smaller than a grain of salt, the robots can navigate their environment, measure temperatures and respond autonomously using tiny onboard computers.