<span style="color: #222222;">Scientists from Sungkyunkwan University in South Korea have developed flexible wearable sensors that stick to the skin, paving the way for novel health trackers that could monitor a variety of human activities. &nbsp;<br />” <br />” They said the device could monitor an array of human activities, including electrocardiogram signals, pulse and speech patterns, demonstrating its potential use in medical applications.<br />” <br />” Researchers said, for a wearable sensor to be truly effective, it must be flexible and adhere fully to both wet and dry skin but still remain comfortable for the user.<br />” <br />” The material that the sensing compounds rest upon is crucial. Woven yarn is a popular substrate, but it sometimes does not fully contact the skin, especially if that skin is hairy.&nbsp;<br />” <br />” Typical yarns and threads are also vulnerable to wet environments. Adhesives can lose their grip underwater.&nbsp;<br />” <br />” To overcome these challenges, researchers worked to develop a low-cost, graphene-based sensor with a yarn-like substrate that uses octopus-like suckers to adhere to skin. <br />” <br />”Researchers observed that the sensor could detect a wide range of pressures and motions in both wet and dry environments.&nbsp;</span><br />