Our skin contains millions of microscopic helical sweat ducts that may act as antennas that reveal a person’s physical and emotional state from a distance, Hebrew University researches have discovered.

Treating the skin as an array of helical antennas could open up a new method of measuring physiological changes. The researchers beamed microwave signals to test subjects and measured the reflected signals. They found a strong correlation between subjects’ blood pressure and pulse rate, and the frequency response of their skin.