I may not be correct in this, but I look at it sometimes as there being certain areas that are more developed in his brain (amazing ability to know facts about his area of interest that he has had since preschool) or ability to excel if he has an interest in something but it almost makes another area of his brain less developed than peers…can’t tie shoes. I think it is common to have a bit of naïveté (child like) in certain areas. It can be endearing, like a child within a grown adult, but not in every aspect of life. Another one is having difficulties reading people or understanding figuratively/literally when people say things. The car thing is interesting…not recognizing that this would be of interest to someone. That is a bit childlike.