A small toilet-based sound sensor that can tell the difference between peeing, pooping and diarrhea may one day help prevent cholera outbreaks. "The hope is that this sensor, which is small in footprint and noninvasive in approach, could be deployed to areas where cholera outbreaks are a persistent risk," said researcher Maia Gatlin of the Georgia Institute of Technology. Cholera is an acute diarrheal disease that can kill within hours if untreated, according to the World Health Organization. So Gatlin and her team wanted to see if they could identify bowel sounds. They tested the idea in a way that...