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It's a world we barely see, but it is teeming with life. In the dust of a typical house, carpet beetles, mites, silverfish, and other creatures live and die, producing allergen-laden dust. Meanwhile, stinky mold, bacteria, and yeast lurk undetected in heating and cooling systems. Debris dispersed into the air from these organisms can cause runny noses, itchy eyes, coughing, headaches, and breathing difficulties. Some people, especially those made highly sensitive by allergies, suffer from devastating health problems and the worry that, as one such sufferer lamented, "My house is killing me!" Scrutinizing house dust and air samples with a microscope, indoor air quality expert Jeffrey C. May has spent his career helping people identify what's causing their chronic health problems.