Romantic love allows you to focus mating energy. Attachment sustains that relationship as long as necessary to raise your baby.

Most of us make up our minds in the first three minutes of meeting someone whether there's a potential for a relationship.

We're not very dangerous animals; we don't have a horn like a rhino or quills like a porcupine.

My hypothesis is that conservative Republicans have very clear values, and when you have that, you're simply more relaxed.

There is more and more data indicating that there is a biological basis to your political views.

It certainly would have been adaptive for ancestral man to have a chubby wife during stressful times of famine. Not only would she have had more calories to burn, and thus more energy and endurance, but since fat stores estrogen, she would have remained fertile for longer.

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.