Researchers at the University of Pennsylvania described a microscopic robot under one millimeter long that integrates sensors, an onboard computer, a motor and tiny solar cells to convert light into propulsion and computation. The team led by Marc Miskin demonstrated programmable motion and basic sensing behaviors in fluid environments. The devices use electric fields to generate movement and tiny photovoltaic elements to power sensing and logic functions; assembly and programming workflows are being refined for coordinated behaviors. Investigators cited potential biomedical applications, including targeted diagnostics and microscale interventions, while stressing significant translational hurdles remain. Key next steps include expanding cooperative behaviors, adding therapeutic payloads, and evaluating biocompatibility and control inside complex biological fluids.