seven-year-olds start to understand biology in a new way. Four-year-olds think that when you die you simply move to a different location, while older children develop the tragic understanding that death is an irreversible process, especially if they have pet fish or live on a farm. And older children begin to grasp subtle psychological concepts like sarcasm and ambivalence; they know that you can say one thing and mean something quite different, or feel sadness and happiness simultaneously. Seven- and eight-year-olds also engage in the exploration and discovery that we see at such a fever
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