From my studies of genetics and neuroscience I have come to believe that people fall into four broad personality types - each influenced by a different brain chemical: I call them the Explorer, Builder, Director, and Negotiator.

We still have community, but we don't seem to have local community. Even in a small town where you know your neighbors and your mother's down the street, they're not in arm's length.

For so many generations, a woman's only career path was to marry well and to marry up. Those days have changed.

Along with our many human propensities, we evolved a huge cerebral cortex with which we make decisions.

Natural beauty really entices men. They will tell you this time and time again, and studies consistently prove it.

Saliva has testosterone and estrogen. When you kiss, you're having a chemical experience.

People have often asked me whether what I know about love has spoiled it for me. And I just simply say, 'Hardly.' You can know every single ingredient in a piece of chocolate cake, and then when you sit down and eat that cake, you can still feel that joy.