“THE NATURE-NURTURE DEBATE is over.” So begins a recent article with a title—”Three Laws of Behavior Genetics and What They Mean”—as audacious as its opening sentence.1 The nature-nurture debate is, of course, far from over when it comes to identifying the endowment shared by all human beings and understanding how it allows us to learn, which is the main topic of the preceding chapters. But when it comes to the question of what makes people within the mainstream of a society different from one another—whether they are smarter or duller, nicer or nastier, bolder or shyer—the nature-nurture
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