Infants, toddlers, and preschool children have considerable
implicit knowledge about topics that are found in science books.
Infants, for example, can form general categories that differ as to
whether photographs or toys depict animals or various inanimate
categories (Mandler and McDonough, 1998). Indeed, they can
make inferences about them (e.g., of references for above:
Baillargeon, 1994; Leslie, 1994; Spelke and Van de Walle, 1995).