As a country and as a world, we are not comfortable with women in leadership roles. We call little girls bossy.

Success for me is that if my son chooses to be a stay-at-home parent, he is cheered on for that decision. And if my daughter chooses to work outside the home and is successful, she is cheered on and supported.

No industry or country can reach its full potential until women reach their full potential. This is especially true of science and technology, where women with a surplus of talent still face a deficit of opportunity.

Give us a world where half our homes are run by men and half our institutions are run by women. I'm pretty sure that would be a better world.

I hope you find true meaning, contentment, and passion in your life. I hope you navigate the difficult times and come out with greater strength and resolve. I hope you find whatever balance you seek with your eyes wide open. And I hope that you - yes, you - have the ambition to lean in to your career and run the world. Because the world needs you to change it.

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.

After my husband, Dave, died, I called my friend Adam, a psychologist who studies how people find meaning in our lives, and I asked him what, if anything, I could do to help myself and my kids get through this. We started talking about resilience, then reading about it, then talking to other people who had gotten through grief and other huge challenges. In time, those conversations and that research helped me heal.