Wendy Kopp: If you go back to 20 years ago, the folks who were the top graduates — and the most highly sought after, who had the most other options — very, very few of them were thinking about teaching.  And it has to do with the societal image of teaching, the financial implications of the choice and such, as well.  But I just knew that for this to work, for us to actually inspire a movement of the most promising future leaders, to channel their energy towards tackling this problem, we were going to have to surround this with an aura of selectivity and status. So, that led to this idea that we have to be highly selective.  What I later learned, of course, is that this is such incredibly hard work. It is a very, very rare person who — straight out of college — is ready to not just survive in the classroom, but actually excel,  actually put their kids on a trajectory to greater opportunity, who will then take the lessons from success and not the lessons of failure and will leave more committed and not more disillusioned. So we became even more selective over time.  We’re probably more selective now than we’ve ever been because every year we learn more about what it actually takes.