fatigue

A prototype flexible electronic mouth guard can measure lactate levels in an athlete’s saliva, tracking muscle fatigue during training and performance. Learn mo…

It’s almost impossible not to feel outraged these days. But overexposure to information that makes us angry can wear us down. Senior health and medicine editor …

How a person types can reveal the state of their brain, according to a study that tracked keystrokes when the typist was alert or groggy. Cynthia Graber reports…