"Social science now tells us that if we can take indigent girls between the ages of 10 and 14 and give them a basic education, we can change the fabric of an entire community. If we can capture them in that fleeting window, great social advances can be achieved. Give enough young girls an education and per capita income will go up; infant mortality will go down; the rate of economic growth will increase; the rate of HIV/AIDS infection will fall. Child marriages will be less common; child labor, too. Better farming practices will be put into place, which means better nutrition will follow, and overall family health in that community will climb. Educated girls, as former World Bank official Barbara Herz has written, tend to insist that their children be educated. And when a nation has smaller, healthier, better-educated families, economic productivity shoots up, environmental pressures ease, and everyone is better-off. As Lawrence Summers, a former Harvard University president, put it: "Educating girls may be the single highest return investment available in the developing world." Why is that? Well, you can make all the interpretations you like; you can posit the gendered arguments; but the numbers do not lie."