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.

You fall in love with somebody who fits within what I call your 'love map,' an unconscious list of traits that you build in childhood as you grow up. And I also think that you gravitate to certain people, actually, with somewhat complementary brain systems.

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

Having different types of stocks in your portfolio can enhance returns.

Genetics is crude, but neuroscience goes directly to work on the brain, and the mind follows.

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