First-borns Get the Brains
New research indicates what I’ve always known: that firstborn sons are smarter than our siblings. The average IQ of first-born men is 103.2; for second-borns, 101.2; for third-borns, 100.0. Interesting, second-borns whose older siblings died in infancy had average IQs of 102.9; third-borns whose older siblings died young had IQs of 102.6. The New York Times has some analysis of the issue, including one strange fact: before age twelve, younger siblings are smarter. Very strange.
