Rich Educationally Richer

No Rich Child Left Behind - NYTimes.com:

...What is news is that in the United States over the last few decades these differences in educational success between high- and lower-income students have grown substantially.

One way to see this is to look at the scores of rich and poor students on standardized math and reading tests over the last 50 years. When I did this using information from a dozen large national studies conducted between 1960 and 2010, I found that the rich-poor gap in test scores is about 40 percent larger now than it was 30 years ago...