Is this study talking about Nobel Prize winners - or better yet, Fields Medal-winning mathematicians? Or just authors or something? I'm about ready to say "I defy the data; what about von Neumann?" Maybe there are people who can achieve through diligence what others achieve by genius, but to say that genius doesn't help at all... I defy the data.

(If you told me that IQ didn't make a difference past 140, I'd be quite willing to believe that IQ tests don't work past 140. Richard Feynman's measured IQ was 137, which as John K Clark observed, says more about IQ tests than it does about Feynman.)