Those of us fortunate enough to have spent most of our lives under a solidly built roof sometimes take for granted the health benefits of modern housing. We assume that our rooms will be well-ventilated and well-lit, with solid walls and windows that keep out disease-carrying insects. Indoor plumbing erases the need for proper sanitation from our list of everyday worries. And as for clean drinking water, we have an endless supply of it at our fingertips. Living without these things — without a proper home — is more than an inconvenience: it’s a health hazard.