A nerd in a Turtle Neck Shirt.--To be a Nurttle one must have two qualities. (1) They must appear in a cheesy "photo of the author" portrait in the back of a novel. (2) In said photograph they must be wearing a turtle neck shirt. (No matter how cool the author may be if they meet the 2 qualifications they are a Nurttle.)
Carl Sagan : Dan Brown...countless other Nurttles out there. WOW!!!