from researchers University of Pennsylvania And University of Michigan has created what they describe as the world's smallest fully autonomous robot. The devices are small enough to work on the scale of biological cells, measuring about 200 × 300 × 50 micrometres, about one-tenth of a millimeter wide.
Despite their size, robots are self-sufficient. Each unit can move, sense its environment, perform basic calculations, and react without external control, tether, or magnetic guidance. According to the researchers, the robot is also cheap to manufacture, with the cost per unit being about one cent.
The work was led in part by Mark Miskin, assistant professor of electrical and systems engineering, who noted that these robots are smaller in size than previous micro-robot systems. Their size puts them in the same category as many microorganisms, opening up research possibilities that larger robots cannot reach.
The findings were published in science robotics And Proceedings of the National Academy of SciencesDetailing how robots integrate power, logic, and motion into a structure smaller than a grain of salt. Robots are designed to survive and operate autonomously for long periods of time, potentially months under the right conditions.
The researchers suggest that long-term applications could include tracking the behavior of individual cells, studying microscopic environments, or aiding the construction of microscopic machines. Because robots operate on the same physical scale as biological systems, they may eventually be able to navigate tissue or lab-grown environments that are inaccessible to existing equipment.
This research remains experimental. There are no consumer-facing applications, and practical use outside laboratory settings is still theoretical. This work represents a technological milestone rather than a deployable technology, highlighting how far miniaturization and autonomous control have progressed, rather than indicating an imminent product or service.
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