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 Before reading this statement i believed that it was possible to have photographic memory and it could be helpful in certain situations.  After reading this statement I clearly see that there isn't much of an advantage to having such things but more of a party trick that could raise some eyebrows.  I believe that the populations that are more able to develop these things are populations that are not as developed in other parts of "normal" growing.  Thus to try and adapt to "normal" society certain attributes are over emphasized to try and combate the delays or lack of other attributes such as speech and other senses or mental capacity.