Fresh water quenches thirst almost instantly, but salt water doesn't. New research shows how cells in the gut and on the tongue help the brain keep just the right concentration of salt in our bodies.
Does exercise recovery work? Science writer Christie Aschwanden examines the physiology and effectiveness of sports drinks, protein powders and other products and services in her new book, Good to Go.
Dehydration has long been known to slow physical performance. Now there's evidence that too little water can hurt cognitive performance, too, making complex thinking tasks harder.
Prosecutors say Terrill Thomas, 38, had been left alone in his county jail cell for seven days without water. The medical examiner's office says he died of "profound dehydration" in the 2016 incident.