Younger teachers are definitely more likely to have worked at charter schools as opposed to have just heard of them. Charter schools explicitly look, often, to hire younger people.

Coming to the civil rights movement in the twentieth century, we begin to have this idea that's still with us today, which is that the main purpose of public education is closing achievement gaps.

[Nineteenth century American educator] Catharine Beecher is really associated with the idea that a mother works with children in the home and a teacher works with children at school, and that therefore women are almost biologically predisposed to do this job.

Men are more salary-sensitive when they're choosing a job.

I wrote a work of history, I looked at over 500 sources - I spent three-and-a-half years on the project. I think the most gratifying and wonderful thing about the reaction is that people are learning things from the history that feel relevant to today.

This is something that Randi Weingarten said to me when I interviewed her once, which I think I quote in chapter nine. She talks about how only 7 percent of private sector workers in the American economy are in unions. So all the protections that teachers have that are due to collective bargaining - including generous pensions, generous health plans, limits to what they can be asked to do after school and in the summers - all of those things are sources of resentment to the public. And I think that politicians have played off of that quite effectively.

I think any sort of system that gives teachers more opportunities like teacher-led schools is a positive one that's going to lead to better retention in the profession, and it's going to be more intellectually challenging, so teachers stay engaged with their work over the many years of their career.