I was trying to find a copy of the 48hrs episode they referenced in this article, but this is one of the contentious topics that completely obliterated the blank-slate idea in my mind. I do not see how it would be possible to be "blank slate" and then have this much in common with an "identical stranger." - This is only marginally related to the idea of what we inherited from our ancestors, but results of this type are earth-shattering to those positions that might suggest that genetics play no role in human development. - http://science.howstuffworks.com/genetic-science/twin1.htm