Guess the size of the world's smallest robots. They measure 200 by 300 by 50 micrometers, smaller than a grain of salt! The robots are fully programmable and autonomous,  developed by researchers of the University of Pennsylvania and the University of Michigan. Researchers expect the robots to be used in health care and industry. It could advance medicine by monitoring the health of individual cells and manufacturing by helping construct microscale devices.Powered by light, the robots ...

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