"Research has linked such feelings of powerlessness to the kinds of health problems plaguing Bayview and many other communities around the world. This research shows that members of poor communities do not merely experience higher levels of violence; they are also more likely to have high blood pressure and frequent periods of increased heart rate, which contribute to a higher mortality rate. What's more, similar health problems have been shown to afflict the least powerful members of nonhuman primate species. Taken together, these and other findings suggest that the psychology of powerlessness can wreak havoc on people who sit low on the totem pole of any social structure. "Poverty, and the poor health of the poor, is about much more than simply not having enough money," says Robert M. Sapolsky, professor of neurology at Stanford University. "It's about the stressors caused by a society that tolerates leaving so many of its members so far behind."