As social animals, we need to exchange juicy tales about someone - to connect with one another. For millions of years our forebears must have sat around the campfire, whispering about everyone they knew.

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

Women spend their lives trying to look good for men. So a woman who feels she's sending the right visual signals is pleased with herself.

If two very different people pool their DNA, they'll create more genetic variety, and their young will come to the job of parenting with a wider array of skills.

You can really get poked in the back and not feel it very much, but just a feather around your lips and you really do feel it.

Experiences shape the brain, but the brain shapes the way we view experiences, too.

Today, American women bear an average of 2.2 children that live to adulthood. Across most of Europe, women bear even fewer young.