From MIT and NBER, this just in:

“…almost all girls with the ability to reach high math achievement levels are not doing so.”  (Here’s the paper.)

The basic premise, which I believe in my bones to be correct, is that half of the very best math students in this country — the female half, by and large — do not participate in the ranking systems that serve to identify them.

The end result is a mess all around:

Good news, though: fixing the problem is as simple as raising awareness.  Any girl who has yet to finish 12th grade can participate in these competitions.  If you know a good candidate, send her to maa.org/amc, to dtmath.com/amc, or to this short video series on YouTube.