A team of engineers from China and the US has built the world’s smallest remote-controlled walking robot. Its size is only half a millimeter, and in its appearance it resembles a crab. Such tiny robots have a range of potential applications, from assisting in surgical operations (for example, to remove blood clots or tumors) to repairing various equipment in hard-to-reach places. And the smaller the robots, the more scenarios for their use. Although the robot shown in the picture does not yet have a specific application, the methods on the basis of which it is developed may serve in the…