"When I wrote Lean In, some people argued that I did not spend enough time writing about the difficulties women face when they don't have a partner. They were right. I didn't get it. I didn't get how hard it is to succeed at work when you are overwhelmed at home. I wrote a chapter titled "Make Your Partner a Real Partner" about the importance of couples splitting child care and housework 50/50. Now I see how insensitive and unhelpful this was to so many single moms"