School districts across the country are struggling to fill vacancies among their teaching staff. In addition to stepping up their recruitment efforts, some districts are looking to turn more of their existing staff into teachers.NPR's Cory Turner reports on the Mississippi Teacher Residency program, and on the impact it is having in the state's capital, Jackson.In participating regions, you'll also hear a local news segment to help you make sense of what's going on in your community. Email us at considerthis@npr.org.