Edge held a seminar on morality. Here's Joshua Knobe:

Over the past few years, a series of recent experimental studies have reexamined the ways in which people answer seemingly ordinary questions about human behavior. Did this person act intentionally? What did her actions cause? Did she make people happy or unhappy? It had long been assumed that people’s answers to these questions somehow preceded all moral thinking, but the latest research has been moving in a radically different direction. It is beginning to appear that people’s whole way of making sense of the world might be suffused with moral judgment, so that people’s moral beliefs can actually transform their most basic understanding of what is happening in a situation.

David Brooks' illuminating column on this topic covered the same ground:

Paul Bloom of Yale noted that this moral sense can be observed early in life. Bloom and his colleagues conducted an experiment in which they showed babies a scene featuring one figure struggling to climb a hill, another figure trying to help it, and a third trying to hinder it.

At as early as six months, the babies showed a preference for the helper over the hinderer. In some plays, there is a second act. The hindering figure is either punished or rewarded. In this case, 8-month-olds preferred a character who was punishing the hinderer over ones being nice to it.

This illustrates, Bloom says, that people have a rudimentary sense of justice from a very early age. This doesn’t make people naturally good. If you give a 3-year-old two pieces of candy and ask him if he wants to share one of them, he will almost certainly say no. It’s not until age 7 or 8 that even half the children are willing to share. But it does mean that social norms fall upon prepared ground. We come equipped to learn fairness and other virtues.

Advantage Locke over Hobbes.