The engine groans to a halt, signaling for people to begin filing down the aisle and out onto the gravel road. As the bus surges forward again to make its 5:30 stop in Suretka, you can look down a hill on the opposite side of the road and see the elementary school of Bambu. It is a wide, single-story building with green cement walls and a tin roof. Extending out from the main structure is an awning of sorts to cover the...