Seeking more goodly creatures

In principle, genetic and reproductive technologies might allow "enhanced" children--with mental aptitudes and personal qualities improved beyond their expected abilities or even beyond humanity's normal range. Worry about a "brave new world" has already begun, but is that world imminent? And assuming that parents could choose traits for their children, would this be a bad thing? Many people think so for many different reasons, Henry Greely writes, but before we decide to regulate genetic enhancement, we need to decide how it differs from other forms of enhancement, traditional and new, and if those differences are important enough to justify regulation.