Facial attractiveness in binary?

Ever thought about what makes a face attractive? Is it merely physical features (symmetry, averageness, etc.) or something more to it (consciousness for example - you have a good perception about that person)? Here's an interesting read up appeared in Science News where scientists in many disciplines try to unfold the mysteries behind it; and some in computer science have even been working to make computers learn and then label faces just like how humans perceive beauty.