. . . "3- and 4-year-olds believe in the supernatural powers of fairies, goblins, and other enchanted creatures. ??? ??? ??? Follow-up research indicates that even though preschoolers have difficulty with Piagetian class inclusion tasks, they organize their everyday knowledge into nested categories at an early age. ??? ??? ??? Piaget called childrens self-directed utterances _________ speech, reflecting" .