Up to 30 percent of children in low-resource countries suffer from stunted growth. Inadequate nutrition and diarrhea have long been blamed, but scientists have, until now, been unable to explain a large percentage of stunting cases. Two new studies, however, show that a tremendous number of children with no signs of diarrhea are carrying harmful infections. These infections ultimately prevent them from reaching their full potential and perpetuate a vicious cycle of poverty. "If we're just targeting diarrhea, that may not be enough. We need to be addressing these asymptomatic exposures as well,...