If we think deeply about our childhood, not just about our memories of it but how it actually felt, we realize how differently we experienced the world back then. Our minds were completely open, and we entertained all kinds of surprising, original ideas. Things that we now take for granted, things as simple as the night sky or our reflection in a mirror, often caused us to wonder. Our heads teemed with questions about the world around us. Not yet having commanded language, we thought in ways that were preverbal—in images and sensations. When we attended the circus, a sporting event, or a
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