We hear plenty about the widening income gap between the rich and the poor in America and about the expanding distance dividing the haves and the have-nots. But when detailing the many things that the poor have not, we often overlook the most critical their health. The poor die sooner. Blacks die sooner. And poor urban blacks die sooner than almost all other Americans. In nearly four decades as a doctor at hospitals serving some of the poorest communities...