Alexander Fleming's discovery of penicillin aside, most homeowners don't view mold as their friend and for good reason.
The fungus is a decomposer that feeds on dead organic material such as wood, which works well for the environment. But mold can destroy building materials and cause health problems when it's found indoors, according to the Missouri Department of Health and Senior Services Web site. Moisture is the culprit because the spores require it to grow.
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