When you fight, anger drives up testosterone in both men and women.

Falling in love was not really a choice; it just struck me.

People have been looking for love potions since hunter-gatherer societies.

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.

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.

Men tend to be hierarchical, but women are driven to make lateral connections so they can cooperate.

When people tell you to walk a certain way, it's like not thinking of a purple tomato. You can't not do it.