DAVID GREENE, HOST:
You know, when we think about disparities in American education, we think about things like race, gender. There is also income, which is one of the most persistent disparities. Children from more affluent families do better in school on average than children from poor families. And there's new social science research exploring why this is the case. To talk about it, I'm joined by NPR social science correspondent Shankar Vedantam. Hey, Shankar.
SHANKAR VEDANTAM, BYLINE: Hi, David.