Poverty goes straight to your head

Absolutely required reading for anyone concerned about poor children and the achievement gap:

For decades, education researchers have documented the disproportionately low academic performance of poor children and teenagers living in poverty. Called the achievement gap, its proposed sociological explanations are many. Compared to well-off kids, poor children tend to go to ill-equipped and ill-taught schools, have fewer educational resources at home, eat low-nutrition food, and have less access to health care.

At the same time, scientists have studied the cognitive abilities of poor children, and the neurobiological effects of stress on laboratory animals. They've found that, on average, socioeconomic status predicts a battery of key mental abilities, with deficits showing up in kindergarten and continuing through middle school. Scientists also found that hormones produced in response to stress literally wear down the brains of animals.

And it gets worse:
McEwen also noted that, at least in animals, the effects of stress produce changes in genes that are then passed from parent to child. Poverty's effects could be hereditary.