Jared Diamond, professor at UCLA and winner of the Pulitzer Prize for his book Guns, Germs and Steel, wrote an op-ed piece in the New York Times today entitled, "Romney Hasn't Done His Homework." In it, he criticizes Romney for not properly conveying the message of his work when citing Diamond in a recent speech. The bulk of the op-ed outlines Diamond's main theories with regard to geography and world history. He spends less time talking about Romney himself. I personally did not read what Romney said with regard to Professor Diamond's work, but found the article useful in offering a short and concise version of Diamond's theory.
Here's a link to the article:
http://www.nytimes.com/2012/08/02/opinion/mitt-romneys-search-for-simple-answers.html