Wearable patch vibrates when danger is nearby

Your phone can warn you about bad weather or heavy traffic. However, some dangers cannot wait for you to notice a notification. A hazardous gas may already surround you. Contaminated water may look perfectly normal. By the time you unlock your phone and check an alert, you could have already spent valuable time near the threat. Researchers at North Carolina State University have developed a wearable patch that takes the phone out of that warning process. The device detects environmental hazards,