Where I work there are far more women in junior semi skilled areas and more men in serious research jobs. There are obvious exceptions and a fair number of women in middle management. It has got better since I have been there but most women cannot commit to 60 hours a week after having kids (our wages aren't high enough to cover the childcare required anyway) and are more often the ones who take of time when the kids are sick. The men usually have wives to look after the kids. The most successful women I know in science either never had kids or had them very young and started their career afterwards.
