Over the years, plastic surgeons and other physicians and scientists interested in aesthetics have explored the “ideal proportions” of the human face and its features. This has led to myriad schemes for classifying facial types, suggesting courses of treatment, and even planning surgical modifications. More recently, we have begun to focus on facial recognition – using experimental psychology techniques to find out exactly how people recognize each other or assign certain faces to particular groups (e.g., age groups, ethnicities, etc.). Out of this inquiry has come an interesting body of literature regarding facial features that the brain uses as shorthand for gender – how a person can decide on the gender of a face after seeing a single image flashed on a screen for less than a second. This work has determined that the ridge of the brow plays an important role, as well as the prominence of the jaw.