I read somewhere (can't remember where) that preschool children can be taught and gain a lot of knowledge in specific areas and that this knowlege easily disappears a couple of years down the road when the focus has been shifted to something else. The examples were mostly in the domain of history and .
I have seen this with both my children. They had obsessions as two and three year olds which involved huge masses of memorised data. Within six months of moving on to other things they'd forgotten most of the information associated with the obsession.
