Maybe researchers got this one wrong and the true reason firstborns are generally smarter is the amount of iodine they get from their mother. Any further suggestions/research?
Firstborns ’smarter’ than younger siblingsFrom correspondents in New York
June 22, 2007 05:17am
FIRSTBORNS frequently score higher on IQ and achievement tests than their younger siblings, but a new report suggests that how siblings are raised, not their birth order, is what matters when it comes to brain power.
”This study provides evidence that the relation between birth order and IQ score is dependent on t ...
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