[Refers to submitted article before posting comment:] A) As for genetic factors related to the Flynn effect, I think the weight of the evidence is against redu

[Refers to submitted article before posting comment:] A) As for genetic factors related to the Flynn effect, I think the weight of the evidence is against reduction of inbreeding ("heterosis") having a large enough effect size to have much to do with explaining the Flynn effect. Flynn thinks so too, and shows his work.[1] I was actually somewhat influenced by the idea of "hybrid vigor" when I chose my wife, who has different continental ancestry from mine and indeed has blessed me with four children who are smart (by test,[2] not just by my opinion) and who appear to have good immune systems. This is part of tradition that goes back generations in my family of the men marrying women of a different "nationality." B) As for nutritional factors related to the Flynn effect, they have often been proposed, but hardly demonstrated at all. Evidence from a variety of sources, for example the famine that afflicted part but not all of the Netherlands during the German occupation near the end of World War II, and other more extensive data sets, suggest that nutrition too doesn't have enough effect size to explain more than a tiny part of the IQ score increases that make up the Flynn effect.[3] [1] http://www.psychometrics.cam.ac.uk/about-us/directory/beyond-the-flynn-effect#section-9 http://www.psychometrics.cam.ac.uk/about-us/directory/beyond... [2] http://www.davidsongifted.org/youngscholars/Article/Davidson_Young_Scholars___Qualification_Criteria_384.aspx http://www.davidsongifted.org/youngscholars/Article/Davidson... http://cty.jhu.edu/set/ http://cty.jhu.edu/set/ [3] http://www.sciencedirect.com/science/article/pii/S1570677X09000057 http://www.sciencedirect.com/science/article/pii/S1570677X09...