environment : the truth about dust : could those tiny particles be alive? they just mite
The truth about dust comes as rather a shock to many people. After all, their dust doesn't twitch, or jump around. It looks, if not benign, at least inert. Looks can be deceiving. Your house dust is the native habitat of the dust mite--a microscopic arachnid whose ecological niche is to consume the skin scales of humans and other animals. It's not what you'd call a glamorous niche, but the dust mite fills it, with spectacular success. Dermatophagoides pteronyssinus and Dermatophagoides farinae, like the vulture and the hyena, are voracious eaters and scavengers. Dust mites are relatives of the spider, colorless and so small as to be invisible to the naked eye. They thrive in warm, humid conditions. A gram of house dust (about half a teaspoon, sans fuzz) contains as many as 1,000 of them. Dust mites don't fly. And their feet are sticky, so even when dust is disturbed the little arachnids stick to whatever surface they're on. (It makes them extremely diffic...