Here's what seems like the 87th New York Times article of the last month on that single study in Norway finding a slightly higher average IQ for oldest brothers:
Separated by Birth
By ELIZABETH GILBERT and CATHERINE GILBERT MURDOCK
The eldest children in families tend to develop higher I.Q.’s than their siblings, researchers are reporting. Skip to next paragraph Enlarge This Image Kelly Blair
— The Times, June 22
LIZ So ... how not surprised were you when you learned that science has now officially declared older children to have higher I.Q.’s than their unfortunate younger siblings? [More]
I'm starting to wish the NYT would go back to treating IQ as That Which Must Not Be Mentioned if it would just get them to shut up about this one IQ study...