This Robot is Tinier than a Grain of Salt

Scientists have created the world's smallest autonomous programmable robot, measuring just 200 by 300 by 50 micrometers—smaller than a grain of salt. These microscopic devices move by creating electrical fields that push ions in surrounding liquid, allowing them to navigate through bodily fluids while powered by LED light pulses. Equipped with miniature computers, the robots can measure temperatures and report on cellular health, with potential applications including surgery, drug delivery, and inspecting living systems.