Researchers in South Korea have developed a flexible electronic device that can switch between different jobs simply by changing the salt concentration around it. The breakthrough could lead to smarter wearable health monitors, electronic skin, and medical devices that can both process and store information without needing multiple electronic components. Wearable technology has advanced rapidly in recent years. To demonstrate the technology, the team created a wearable patch that monitors signs of inflammatory swelling and skin temperature. Future electronic skin could detect injuries and respond automatically, while adaptive prosthetic devices and soft robots could learn from their surroundings and adjust their behavior in real time.