Families' Eldest Boys Do Best on Tests

Curious.

Boys at the top of the pecking order - either by birth or because their older siblings died - score higher on IQ tests than their younger brothers. The question of whether firstborn and only children are really smarter than those who come along later has been hotly debated for more than a century.

Norwegian researchers now report that it isn't a matter of being born first, but growing up the senior child, that seems to result in the higher IQ scores.

Petter Kristensen and Tor Bjerkedal report their findings in Friday's issue of the journal Science.

It's a matter of what they call social rank in the family - the highest scores were racked up by the senior boy - the first born or, if the firstborn had died in infancy, the next oldest.

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