On the morning of Jan. 26, 2001, a magnitude 7.6 earthquake struck the western Indian state of Gujarat. More than 20,000 people were killed and 160,000 injured, many of them crushed by falling buildings. International aid agencies flocked to the scene and began reconstruction. One year later, civil engineer Elizabeth Hausler traveled to Gujarat on a Fulbright scholarship, hoping to learn how she could use her skills to build homes that withstand tectonic shifts. She found that many survivors didn’t want to live in their new, donor-built earthquake-resistant houses because they were made from odd materials and in strange styles. “One approach I kept seeing over and over was designing a house with the toilet inside,” says Hausler. “People don’t want the toilet in the house, because the houses are so small. So that ends up being wasted space. And they don’t use the toilet, so they don’t have a toilet.” It wasn’t enough for a house to be solid, realized Hausler. It needed to fit. Even when donor-built homes suited people’s needs, they were frequently too expensive. “I didn’t see a single example of a technology introduced by a local or foreign organization that continued to be used without…