Has anyone else noticed a change in the estrogen level here lately? I see a lot more XX types commenting and posting at gnxp. For example, long-time gnxper Jacqueline calls our attention to this article on a possible correlation between iron deficiency and math skills in girls. razib provides the complete pdf here. Also, the whole "Summerian" issue seems to have drawn an influx of females, empirically supporting Summer's position, in that they represent females in science and math, in approximately the predicted ratios. :)

Addendum: Gnxp readers, please take the sex-and-MBTI survey in the extended entry-- I need sample size! :)

It would be nice if something as fixable as iron deficiency totally informed the differences between the sexes in math aptitude, but I doubt that is a viable hypothesis. There are gross morphological variations between male and female brains and hormonal differences as well. Would you help me test my hypothesis? I remember the last time razib polled readership gnxp was 92% XY. Please vote. :)

Sex?
	XY
	XX

And while we're polling, let's see the distribution of gnxp readers against MBTI-- If your type is not in the voting box, leave it blank. Note separate voting boxen for guyz and grrls.

MBTI part I XY
	ESTJ
	ESTP
	ISTJ
	ISTP
	ESFJ
	ESFP
	ISFJ
	ISFP

MTBI Part II XY
	ENFJ
	ENFP
	INFJ
	INFP
	ENTJ
	ENTP
	INTJ
	INTP

MBTI Part I XX
	ESTJ
	ESTP
	ISTJ
	ISTP
	ESFJ
	ESFP
	ISFJ
	ISFP

MTBI Part II XX
	ENFJ
	ENFP
	INFJ
	INFP
	ENTJ
	ENTP
	INTJ
	INTP