We adorn the neck with jewels and perfumes, and it plays a key role in human courtship ritualsMartin Parr/Magnum PhotosThe NeckKent Dunlap (University of California Press)The late writer and filmmaker Nora Ephron famously felt bad about her neck. Ephrons concern, as expressed in her best-known essay I Feel Bad About My Neck, was ageing, and the neck in particular as a dead give-away of the passage of time. The visibility of the area and the truth it exposed was cause, for Ephron, to cover up with turtlenecks and scarves.For Kent Dunlap, a biologist at Trinity