" Children not only think better as they mature; they also become capable of thinking about their own mental processes. Memory capacity may not expand in any real sense, but children (and adults) learn how to boost their recall by various strategies, ranging from the ways in which they group or store things to the kinds of tally systems they utilize on paper or in their heads. Children also learn to think about their own problem-solving activities: How can I best handle a new challenge? Which system or which tool would be useful? Who can I turn to for help? What is relevant and what is irrelevant to a problem I am trying to solve or a principle I am seeking to discover or master? Often these lessons are learned by watching others reflect on their memories or their thinking processes, by mastering practices common in the culture, or by following oft-repeated adages; even left pretty much to their own devices, however, in seems reasonable to assume that nearly all youngsters will improve somewhat in the "metacognitive" areas between the age of seven and adulthood (which itself begins at markedly different ages across cultures). "

― Howard Gardner , The Unschooled Mind: How Children Think and How Schools Should Teach