Though this may surprise some readers, liberal and conservative economists often agree on the nature of the problems posed by various economic practices, even as they vigorously disagree about the solutions to those problems.

We can learn a great deal by reading Battle Hymn of the Tiger Mother, but we cannot read the book without being both impressed and grieved.

It is as if we are now living on a new planet — one in which all the natural boundaries of sex and reproduction have been left behind. The technologies of reproduction are redefining sex, marriage, relationships, family, and the human story.

There are certain questions now pressed upon us that previous generations would never believe could be asked. One of these is thrust upon us by events in New York City, where a well-known Ivy League professor has been arrested for the crime of incest. What makes the question urgent is not so much the arrest, but the controversy surrounding it.

Parents cannot be spectators in the lives of their children, but should set rules, establish expectations, enforce limitations, and constantly monitor their teenagers’ digital lives. Anything less is a form of parental negligence.

Who needs marriage? I do. You do. We all do — and for reasons far more fundamental than can be explained “in purely practical terms.”

Evangelical Christians are gravely concerned about the family, and this is good and necessary. But our credibility on the issue of marriage is significantly discounted by our acceptance of divorce. To our shame, the culture war is not the only place that an honest confrontation with the divorce culture is missing. Divorce is now the scandal of the evangelical conscience.

Christians must see children as gifts from God, not as projects, understanding family life as a crucible for holiness, not an experiment in happiness.

Steve Jobs is a businessman of unquestioned ability, a technological wizard, and one of the greatest orchestrators of “cool” in world history. Nevertheless, he has not been known as a critic of pornography . . . until now.