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.

People compose poetry, novels, sitcoms - for love.

The brain was not built to walk into a bar, where you know nobody, and start a conversation. That's not the way humanity has courted.

There are cognitive processes and limbic reactions associated with basic emotions. And you can change brain chemistry, but you're still not going to change memories and experiences in a human being.

The human brain is built to compare; it's Darwinian to consider an alternative when one presents itself.

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

As societies continue to loosen their standards regarding what is appropriate female and male behavior, I think we are going to realize we have not only underestimated women, but also men.