Until a few decades ago, scholars believed that young children know very little, if anything, about what others are thinking. Swiss psychologist Jean Piaget, who is credited with founding the ...

IT is late afternoon, but the four-year-old insists: “It can’t be. I haven’t had my nap.” Such is the mind of the child, by most indications illogical and full of nonsense. Not so, says Jean Piaget, a ...

A Swiss psychologist experiments with babies, including his own, and comes to the conclusion that their view of reality has much in common with that of the sophisticated physicist ...