The study of intelligence has a long and somewhat checkered past. There are many reasons for this mixed background but, almost certainly, one is that people can be intelligent, in a conventional sense, and lack much (and sometimes, seemingly any) social, practical, or emotional skills (Sternberg, 2003). The so-called intelligent person may do well on a conventional intelligence test but fare only poorly in his or her ability to adapt to the environment, which, from a Darwinian point of view, is essential to intelligence. Indeed, historically, intelligence has been defined at least in...