The New York Times, August 26, 2016: The Good News About Educational Inequality

"Now we know better, the result of decades of scientific research about brain development, poverty and the long-term effects of high-quality preschool programs. But low-income families haven’t always had the same information about the unique importance of early childhood. Indeed, part of why the achievement gap grew in the 1980s and 1990s was that rich families rapidly increased their investment of both time and money in their children’s cognitive development."