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In common usage the words "child's play" often indicate something extremely simple. Your IEdIitor has been impressed by his recent readings of the pioneer child psychologist Piaget Piaget suggests that child's play ceases abruptly when the task is no longer challenging. Our usual connotation therefore slanders the child. Piaget further suggests that what interests the child is the idea of a problem known to be challenging yet suspected of being solvable. Great joy and elation come from the satisfactory solution of such a problem. Clearly, science is child's play.