Researchers: IQ Matches Birth Order for Sons

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First-born boys traditionally have a lot of advantages. They inherit thrones, family wealth, and, testing has found: a higher IQ. The theory that this is due to "social rank" within the family has been given a boost by a new study in The Journal of Science.

Norwegian researchers found that second sons, whose older brothers died young and left them at the top of the heap, scored higher on IQ tests than those further down the birth order.



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