Things have been quiet on the Larry Summers front lately, but I've found a couple of items suggesting that just maybe Summers was onto something.

First the abstract of a recent NBER Working Paper from Muriel Niederle and Lise Vesterlund:

Competitive high ranking positions are largely occupied by men, and women remain scarce in engineering and sciences. Explanations for these occupational differences focus on discrimination and preferences for work hours and field of study. We examine if absent these factors gender differences in occupations may still occur. Specifically we explore whether women and men, on a leveled playing field, differ in their selection into competitive environments. Men and women in a laboratory experiment perform a real task under a non-competitive piece rate and a competitive tournament scheme. Although there are no gender differences in performance under either compensation, there is a substantial gender difference when participants subsequently choose the scheme they want to apply to their next performance. Twice as many men as women choose the tournament over the piece rate. This gender gap in tournament entry is not explained by performance either before or after the entry decision. Furthermore, while men are more optimistic about their relative performance, differences in beliefs only explain a small share of the gap in tournament entry. In a final task we assess the impact of non-tournament-specific factors, such as risk and feedback aversion, on the gender difference in compensation choice. We conclude that even controlling for these general factors, there is a large residual gender gap in tournament entry.

Next the NYT's (aptly named) Louise Story reports:

At Yale and other top colleges, women are being groomed to take their place in an ever more diverse professional elite. It is almost taken for granted that, just as they make up half the students at these institutions, they will move into leadership roles on an equal basis with their male classmates.

Many women at the nation's most elite colleges say they have already decided that they will put aside their careers in favor of raising children. Though some of these students are not planning to have children and some hope to have a family and work full time, many others, like Ms. Liu, say they will happily play a traditional female role, with motherhood their main commitment.

Just to be absolutely clear--men and women should be equally free to pursue their dreams. But if it turns out that a smaller share of women than men want to be scientists (or any other occupation) then people who suggest that any observed differences might reflect individual choices rather than discrimination should not be treated as though they have violated some taboo.