Modern children were considerably less innocent than parents and the larger society supposed, and postmodern children are less competent than their parents and the society as a whole would like to believe. . . . The perception of childhood competence has shifted much of the responsibility for child protection and security from parents and society to children themselves.

Many older wealthy families have learned to instill a sense of public service in their offspring. But newly affluent middle-classparents have not acquired this skill. We are using our children as symbols of leisure-class standing without building in safeguards against an overweening sense of entitlement--a sense of entitlement that may incline some young people more toward the good life than toward the hard work that, for most of us, makes the good life possible.

In leading-edge companies like Google and Apple, workers are given much freedom and opportunity to play. They know that's an important component of creating new and better products. I believe that at whatever level of work, cashier at a supermarket, janitor at an airport, aide in a cubicle, the addition of a playful attitude makes the job better and the work more enjoyable. A cashier or janitor who smiles and is friendly gets a better response than a surly one.

Honesty remains the best policy. If parents use alcohol in moderation in front of young children, that provides the right model. Drug use is more complex because even moderate use can have unforeseen consequences.

The conviction that the best way to prepare children for a harsh, rapidly changing world is to introduce formal instruction at anearly age is wrong. There is simply no evidence to support it, and considerable evidence against it. Starting children early academically has not worked in the past and is not working now.

When we are polite to children, we show in the most simple and direct way possible that we value them as people and care about their feelings.

The idea of childhood as a social invention, in retrospect, is hardly credible. In the Bible, in writings of the Greeks and Romans, and in the works of the first great educator of the modern era, Comenius, children were recognized as being both different from adults and different from one another with respect to their stages of development. To be sure, the scientific study of children and the increased length of life in modern times have enhanced our understanding of age differences, but they have always been acknowledged.