Richard A. Posner is an extraordinary person. If he did not exist, it would be hard to believe that he could. (. . . ) He writes with a flair that puts most journalists to shame and a depth of knowledge that puts most professors to shame.
Evolution shows that in the long run, if the superior mixes with the inferior, the product is halfway between, and inferior to what you started with in the original superior group - in other words, mongrelized.