I was in Philadelphia recently and spent a couple of days with police officers who walk the beat in the city’s 22nd District. It’s a tough part of town: there were 35 murders there last year, and it’s only about four square miles in size. But an innovative new program, which sends rookie officers out on foot for a full year, is making the city safer. Even more important, perhaps, is the fact that it’s showing locals that police are there to help — and showing young cops that there are good people in “bad” hoods. Here’s my story about Philly in The Economist.