And what I saw happening is that women don't make one decision to leave the workforce. They makes lots of little decisions really far in advance that kind of inevitably lead them there.

Aggressive and hard-charging women violate unwritten rules about acceptable social conduct. Men are continually applauded for being ambitious and powerful and successful, but women who display these same traits often pay a social penalty. Female accomplishments come at a cost.

Success and likeability are positively correlated for men and negatively for women. When a man is successful, he is liked by both men and women. When a woman is successful, people of both genders like her less.

My goal is very clear, and I wrote about it in Lean In, which is that women run half our companies and countries and men run half our homes. As much as I wish that could happen in four years, I don't think that's a likely time period. But I think it can happen sooner than we think. Part of it is having that aspiration and that goal. I think we too often suffer from the tyranny of low expectations.

Until women are as ambitious as men, they're not gong to achieve as much as men.

I don't hold myself out as a role model. I don't believe that everyone should make the same choices; that everyone has to want to be a CEO, or everyone should want to be a work-at-home mother. I want everyone to be able to choose. But I want us to be able to choose unencumbered by gender choosing for us.

It's hard to visualize someone as a leader, if she is always waiting to be told what to do.