Cognitive homogamy

http://m.europe.wsj.com/articles/SB10001424052702303603904579493612156024266?mg=reno64-wsj

http://www.nytimes.com/2012/02/12/books/review/charles-murray-examines-the-white-working-class-in-coming-apart.html?_r=0

Charles Murray coming apart the state of white America 1962-2010. 407 pages. Crown forum. $27