【#Tech24H】A research team from the University of Pennsylvania and the University of Michigan has developed the world's smallest fully autonomous robot, which can be programmed to perform complex motions in liquids. These robots measure just 200 × 300 × 50 micrometers, smaller than a grain of salt, and are capable of independently sensing and responding to their environment. They can operate continuously for months and cost only about 1 cent each. This achievement marks the first implementation of fully autonomous programming at the sub-millimeter scale without requiring external control. The breakthrough opens new directions for micro-robotics, enabling the future integration of additional functionalities for applications in fields such as cellular health monitoring and micro-nano manipulation.