This is, in a sense, discouraging news. You can't solve problems unless you first understand the objective reality underlying them, so if Evans's results are confirmed it will be good in that sense. But stress? What would it take to make the lives of poor children substantially less stressful? The resources to tackle that could be harder to marshal than the resources to eradicate poverty itself. If stress really turns out to be a significant factor in the cognitive development of poor children, addressing the problem may have just gotten harder, not easier.