The cover story of the New York Times magazine this past week, Building a Better Teacher, dealt with the increasingly popular topic of improving America's teaching corps. Author Elizabeth Green makes the point that with 3.7 million teaching jobs in the US, you can't simply hope to attract a better caliber of teacher in the future. Your best bet for improving student outcomes is raising the skill-level of the vast majority of teachers who are neither great nor awful.
Teaching and managing a classroom are, it turns out, skills like any other. Some people are naturally better at them than others, but most people can become better than they currently are with focused, deliberate practice. It's a fascinating piece, and worth checking out.