[kmmlng]

I always got the feeling that the distributions were different for men and women. Male professionals seem to be normally distributed, with a lot of mediocrity, some excellence, and some incompetence. In women, the mediocrity part of the population seems to be missing, so the distribution looks more bimodal.

If that's actually the case and not just a warped perception on my part, it could easily happen that, depending on your own skill-level and environment, you'll be more likely to work with one of the two groups in the bimodal distribution.