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The Epidermal Flux Sensor (EFS), developed by Northwestern University, is the world's first wearable sensor capable of monitoring health without direct skin contact. This groundbreaking device measures the flux of gases—such as water vapor, volatile organic compounds, and carbon dioxide—emitted and absorbed by the skin. By analyzing these gas exchanges, the EFS provides real-time insights into physiological and environmental conditions, offering a non-invasive, highly accurate way to track health metrics. Its innovative design marks a significant leap in wearable technology, enabling continuous health monitoring with unprecedented precision and comfort.