There are only three, but why are the images accompanying the article about dumbing down all of young women? The first, inevitably, suggests "dumb blonde".
Incidentally, the comment you attribute to Paul Buckland, if true, to the effect that the students he failed were "knuckle-draggingly thick", seems to me worthy of serious complaint (from the students) for its offensiveness. You report the mark without comment.
Chris Richards, London Metropolitan University.