The XX Factor : siblings

Take a Younger Sibling to Play Day

Emily Bazelon — Tue, 12 Feb 2008 18:01:00 GMT

I've written before about the effect of birth order on intelligence. It's not my favorite topic, because it pits older siblings against younger siblings and inevitably makes parents feel guilty. Here's a new study from Brigham Young University economics...(read more)

More on Sibling Rank and IQ

Emily Bazelon — Fri, 07 Dec 2007 16:50:00 GMT

There's a great discussion going on in the Fray about the varying IQs of older and younger siblings , featuring Norwegian study author Petter Kristensen and psychology writer Judith Rich Harris. Check it out ....(read more)

Sibling rank and IQ

Emily Bazelon — Mon, 03 Dec 2007 16:33:00 GMT

I wrote last summer about a Norwegian study on birth order that was being treated as definitive proof that first-born kids have higher IQs than their siblings--and that the IQ edge is due to social rank, not biology. (Actually, the results are about brothers...(read more)