ThinkProgress: This month, the National Academy of Sciences (NAS) - an independent group created by Congress - released what is, to date, one of the most extensive reviews of genetically modified crops. The nearly 400-page report looks at everything from genetically modified crops` potential impact on human health to their impact on the environment. It`s a massive, hulking piece of scientific literature - the panel spent two years pouring over more than 1,000 existing studies on genetically modified crops, interviewing...