Let me tell you about this one stretch of Hillsborough Road in Durham, North Carolina. It’s between two freeways, just a short drive from the noble towers of Duke University, and in the space of about a mile, you will find a McDonald’s, a Cracker Barrel, a Wendy’s, a Chick-fil-A, an Arby’s, a Waffle House, a Bojangles’, a Biscuitville, a Subway, a Taco Bell, and a KFC. As you walk down this roaring thoroughfare, you’ll notice that the ground is littered with napkins and bright yellow paper cups. But then again, you aren’t really supposed to be walking along…