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Published May 30, 2012, 12:00 AM

Dust Mite

This 2012 photo released by Mission: Allergy, Inc. shows a house dust mite as seen with an electron microscope, enlarged about 200 times. Experts say dust's constant accumulation has nothing to do with poor housekeeping. Dust is a naturally and continually forming collection of some pretty gross stuff. (AP Photo/Mission: Allergy)

Read the article: Dust: You Can't Defeat it But You Can Control it