Researchers at the University of Texas at Austin have developed a wireless electronic “forehead tattoo” that monitors brain activity and predicts mental fatigue in real time. This ultra-thin, flexible, sticker-like device uses EEG and EOG to track brainwaves and eye movements, offering a comfortable, low-cost alternative to bulky traditional EEG systems. In tests, the e-tattoo accurately detected and even predicted cognitive stress during mentally demanding tasks. Costing just $200 for the main hardware and $20 per sensor, the device could become a practical tool for preventing burnout in high-pressure jobs. Though it currently only works on hairless areas, ink-based versions for hairy regions are in development. The innovation marks a shift toward real-time mental health monitoring in everyday settings.