Media powerhouses Viacom and Disney are developing programs that tap-into the "multiple-intelligence theory," or the notion that children have different learning styles. For example, Disney's new Playhouse Disney channel promotes emotional, social and cognitive development. Disney estimates that the preschool market is worth $21 billion. Separately, cable network Noggin is launching a programming block targeted at nine- to 14-year-olds called "The N."

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