"What scientists haven't realized until recently is that these risk factors have an upside. In other words, the sensitivities and the strengths are a package deal. High-reactive kids who enjoy good parenting, child care, and a stable home environment tend to have fewer emotional problems and more social skills than their lower-reactive peers, studies show. Often they're exceedingly empathic, caring, and cooperative. They work well with others. They are kind, conscientious, and easily disturbed by cruelty, injustice, and irresponsibility. They're successful at the things that matter to them. They don't necessarily turn into class presidents or stars of the school play, Belsky told me, though this can happen, too: "For some it's becoming the leader of their class. For others it takes the form of doing well academically or being well-liked."