Happiness, in one sense, is a function of how closely our world conforms to the infinite variety of human preference.

The conventional explanation for Jewish success, of course, is that Jews come from a literate, intellectual culture. They are famously "the people of the book." There is surely something to that. But it wasn't just the children of rabbis who went to law school. It was the children of garment workers. And their critical advantage in climbing the professional ladder wasn't the intellectual rigor you get from studying the Talmud. It was the practical intelligence and savvy you get from watching your father sell aprons on Hester Street.

To be someone's best friend requires a minimum investment of time. More than that, though, it takes emotional energy. Caring about someone deeply is exhausting.

I know it sounds hard to believe, but habits laid down by our ancestors persist even after the conditions that created those habits have gone away.

Achievement is talent plus preparation. The problem with this view is that the closer psychologists look at the careers of the gifted, the smaller the role innate talent seems to play and the bigger the role preparation seems to play.

The kinds of errors that cause plane crashes are invariably errors of teamwork and communication.

The Rule of 150 says that congregants of a rapidly expanding church, or the members of a social club, or anyone in a group activity banking on the epidemic spread of shared ideals needs to be particularly cognizant of the perils of the bigness. Crossing the 150 line is a small change that can make a big difference.