Sheryl Sandberg is center stage again this week as she promotes her upcoming book, Lean In: Women, Work, and The Will To Lead.  As I understand it, the concept behind “leaning in” has to do with women pushing forward in their careers rather than bailing out as they approach the child bearing years.  This notion came from Sandberg having seen too many women opt out of promising careers before they were even pregnant, for fear of not being able to hack the mother/leader/wife balance game.