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Although toxic materials like phthalates and formaldehyde pose the most danger to healthy indoor air, home owners surely don't want to think about what the kinds of bugs mentioned in this article are doing to their indoor environment.

U.S. homeowners share their abodes with a variety of these arthropods--spiders, insects, centipedes, mites, ticks, lobsters, crabs, shrimp, and scorpions--which are naked to the human eye.

Now in new research from North Carolina State University and the University of Colorado Boulder, scientists have looked into the range and diversity of arthropod life in homes across the United States, according to Tree Hugger.

Interestingly, the researchers found several variables that seem to contribute to a wider array of critters – not necessarily more in number, but more in variety: Having cats or dogs in the home; having a home in a rural area; or having a home with a basement.

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