Nature versus Nurture - Why Rich Parents Don't Matter

I've been following the nature versus nurture arguments most of my adult life and have mostly felt nature produces 90% of the result.  But like most things, the real answer appears not be as simple as, one or the other.

The separated at birth twin studies from the 70s first got my attention on this topic and showed amazing correlation, regardless of environment.  Few studies over the years have successfully challenged this conclusion.  But it looks like these conclusions may have been over-simplified.  This article seems to show environment can be VERY important if it isn't positive or doesn't allow for exposure to knowledge, words and ideas.

It's worth a read in SPITE of it's misleading title:

Why Rich Parents Don't Matter