In a Guatemalan village, students squished into their tiny schoolhouse, two grades to aclassroom. The villagers had tried expanding the school, but the money ran out before the project was finished. No money meant no materials, and that meant no more room for the students. Until one boy got a wonderful, crazy idea: Why not use soda bottles, which were readily available, to form the cores of the walls? Sometimes thinking outside the box—or inside the bottle—leads to the perfect solution.