Another article on this subject with unwarranted jumps to conclusions. The first sentences set the gemneral overgeneralizing tone. But how about this:

"How do girls and boys develop these different views? Most likely, it has to do with the kinds of feedback we get from parents and teachers as young children."

In today's competitive parenting world, I'd be very doubtful that parents are holding back on their girls and 5 is such an early age for such discrepancy to occur. But these are my thoughts on the subject, similar to hers. We both have to back them with proof, if there's any. Otherwise it's idle chatter.