Ninety-nine percent of the time humans have lived on this planet we've lived in tribes, groups of 12 to 36 people. Only during times of war, or what we have now, which is the psychological equivalent of war, does the nuclear family prevail, because it's the most mobile unit that can ensure the survival of the species. But for the full flowering of the human spirit we need groups, tribes.

Tracy is more a help to me than I am to her.

I grew up with my cousins, who were as close as brothers, and frankly, I didn't like what girls were expected to do. I liked horseback riding, playing football, going to rodeos. I wanted to be in jeans all the time, and I couldn't figure out why I was supposed to conform to a certain standard, so I didn't.

My reputation as a ladies' man was a joke. It caused me to laugh bitterly through the 10,000 nights I spent alone.

Many adult bullies hide behind the idea that bullying happens only among children. They conceive of themselves as adults who know better and are offering their hard-earned wisdom to others. The Internet makes that sort of certainty easier to attain: looking at their screens, adult bullies rarely see the impact of their words and actions.

For it is mutual trust, even more than mutual interest that holds human associations together. Our friends seldom profit us but they make us feel safe. Marriage is a scheme to accomplish exactly that same end.