eighteenth birthday. It takes many years to cultivate these skills, which overlap with the ones that Peter Gray maintains are learned during free play. Of greatest importance in free play is that it is always voluntary; anyone can quit at any time and disrupt the activity, so children must pay close attention to the needs and concerns of others if they want to keep the game going. They must work out conflicts over fairness on their own; no adult can be called upon to side with one child against another. Horwitz points out that when adult-supervised activities crowd out free play, children are
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