David Brooks

Harold and Erica got their first glimpse of each other in front of a Barnes & Noble. They smiled broadly as they approached, and a deep, primeval process kicked in. Harold liked what he saw, from the waist-to-hip ratio to the clear skin, all indicative of health and fertility. He enjoyed the smile that spread across Erica’s face, and unconsciously noted that the end of her eyebrows dipped down. The orbicularis oculi muscle, which controls this part of the eyebrow, cannot be consciously controlled, so, when the tip of the eyebrow dips, that means the smile is genuine, not fake.

(That little tidbit about the orbicularis oculi muscle could come in very handy someday.)