Kibera, the largest slum both in Nairobi and Africa, is home to more than a million residents packed into an area less than a square mile (2.6 square kilometers). While life here isn’t easy—it’s one of Nairobi’s poorest neighborhoods and the lack of running water and electricity are constant problems—the slum has its own buzzing industries, which include rows of tilted shacks selling produce, charcoal, homemade breads, secondhand clothes, and shoes.