First-born children possess IQs that are 2.3 points higher, on average, than their younger siblings, a new study contends.
This finding held true even when first-born children didn't survive and a younger child was reared as the eldest, scuttling the idea that genetics determines the difference in IQ among siblings, according to the Norwegian researchers who authored the report, published in the June 22 issue of the journal Science.
No word yet on what goes on with middle children...
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