Matt Yglesias approvingly links to this New York Times story by Lisa Belkin from a few days ago arguing that women ae shut out of science and engineering because of rampant sexism:

In the worlds of science, engineering and technology, it seems, the past is still very much present.

“It’s almost a time warp,” said Sylvia Ann Hewlett, the founder of the Center for Work-Life Policy, a nonprofit organization that studies women and work. “All the predatory and demeaning and discriminatory stuff that went on in workplaces 20, 30 years ago is alive and well in these professions.”

That is the conclusion of the center’s latest study, which will be published in the Harvard Business Review in June.

Based on data from 2,493 workers (1,493 women and 1,000 men) polled from March 2006 through October 2007 and hundreds more interviewed in focus groups, the report paints a portrait of a macho culture where women are very much outsiders, and where those who do enter are likely to eventually leave.

The study was conceived in response to the highly criticized assertion three years ago, by the then-president of Harvard, that women were not well represented in the science because they lacked what it took to excel there.

The purpose of the work-life center’s survey was to measure the size of the gender gap and to decipher why women leave the science, engineering and technology professions in disproportionate numbers.

[T]wo new studies by economists and social scientists have reached a perhaps startling conclusion: An important part of the explanation for the gender gap, they are finding, are the preferences of women themselves. When it comes to certain math- and science-related jobs, substantial numbers of women - highly qualified for the work - stay out of those careers because they would simply rather do something else.

One study of information-technology workers found that women's own preferences are the single most important factor in that field's dramatic gender imbalance. Another study followed 5,000 mathematically gifted students and found that qualified women are significantly more likely to avoid physics and the other "hard" sciences in favor of work in medicine and biosciences....

Rosenbloom surveyed hundreds of professionals in information technology, a career in which women are significantly underrepresented. He also surveyed hundreds in comparable careers more evenly balanced between men and women. The study examined work and family history, educational background, and vocational interests.

The results were striking. The lower numbers of women in IT careers weren't explained by work-family pressures, since the study found computer careers made no greater time demands than those in the control group. Ability wasn't the reason, since the women in both groups had substantial math backgrounds. There was, however, a significant difference in one area: what the men and women valued in their work.

Rosenbloom and his colleagues used a standard personality-inventory test to measure people's preferences for different kinds of work. In general, Rosenbloom's study found, men and women who enjoyed the explicit manipulation of tools or machines were more likely to choose IT careers - and it was mostly men who scored high in this area. Meanwhile, people who enjoyed working with others were less likely to choose IT careers. Women, on average, were more likely to score high in this arena.

Personal preference, Rosenbloom and his group concluded, was the single largest determinative factor in whether women went into IT. They calculated that preference accounted for about two-thirds of the gender imbalance in the field. The study was published in November in the Journal of Economic Psychology....

Starting more than 30 years ago, the Study of Mathematically Precocious Youth began following nearly 2,000 mathematically gifted adolescents, boys and girls, tracking their education and careers in ensuing decades. (It has since been expanded to 5,000 participants, many from more recent graduating classes.) Both men and women in the study achieved advanced credentials in about the same numbers. But when it came to their career paths, there was a striking divergence.

Math-precocious men were much more likely to go into engineering or physical sciences than women. Math-precocious women, by contrast, were more likely to go into careers in medicine, biological sciences, humanities, and social sciences. Both sexes scored high on the math SAT, and the data showed the women weren't discouraged from certain career paths.

The survey data showed a notable disparity on one point: That men, relative to women, prefer to work with inorganic materials; women, in general, prefer to work with organic or living things. This gender disparity was apparent very early in life, and it continued to hold steady over the course of the participants' careers.

Benbow and Lubinski also found something else intriguing: Women who are mathematically gifted are more likely than men to have strong verbal abilities as well; men who excel in math, by contrast, don't do nearly as well in verbal skills. As a result, the career choices for math-precocious women are wider than for their male counterparts. They can become scientists, but can succeed just as well as lawyers or teachers. With this range of choice, their data show, highly qualified women may opt out of certain technical or scientific jobs simply because they can.

Incidentally, the most awful sexist anecdote I read today came from Jodi Kantor's front pager in the New York Times:

Ms. [Elaine] Kamarck, 57, the Harvard professor and a longtime adviser to Democratic candidates, said she was still incredulous about the time her colleagues on Walter F. Mondale’s presidential campaign, all men, left for lunch without inviting her — because, she later discovered, they were headed to a strip club.