Quote
Looking at http://amc.maa.org/amc8/2011/stats/statestatistics/_Overall/Grade_and_Gender_Average.pdf , there is still a male edge of about 1 question (out of 25) on average. It's not huge, but it is statistically significant, and it is found every year on the AMC 8 and other standardized math tests.

Saying differences are found "every year" is deceptive, since these differences have shrunk enormously. There has been a VAST change in girls' average and high-end scores in the last 50 years. How do you explain this? How do you explain the large variability between countries WRT girls' performance?

As I think I have said elsewhere, there MAY be some slight innate biological differences in male and female performance, but we are certainly not in a place yet to know what they are--it's clear that culture is still acting upon these results.