For a doctor doing surgery, the most important things to focus on (besides cutting in the right place) are being fast and clean. That's tough enough to accomplish in a brick-and-mortar hospital—let alone a temporary operating room in the middle of a disaster zone. But that's exactly what Médecins Sans Frontières (Doctors Without Borders, for you stubborn Anglophones) does best, and it's what they've been doing for the past week in Nepal. A surprisingly critical part of that remote rescue? Blow-up tent hospitals.