"Theory of mind" is the phrase researchers use to refer to children's understanding of people as mental beings, who have beliefs, desires, emotions, and intentions, and whose actions and interactions can be interpreted and explained by taking account of these mental states. The gradual development of children's theory of mind, particularly during the early years, is by now well described in the research literature. What is lacking, however, is a decisive explanation of how children acquire this understanding. Recent research has shown strong relations between children's linguistic abilities...