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This is Scientific American 60-Second Science. I'm Erika Beras. Got a minute?

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The dust that accumulates in the corners of your house does more than just cause allergies and aggravation,

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it's also teeming with clues about where you live and who you live with.

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That's the finding of a study in the Proceedings of the Royal Society B.

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Researchers had volunteers at nearly 1,200 homes across the U.S.collect indoor and outdoor dust samples.

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The average home's dust contains about 5,000 types of bacteria and 2,000 types of fungi.

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The fungi gave away a lot about a home's location.

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Different regions have different fungal populations, and thus so do houses within those regions.

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For example, dwellings around the Great Lakes had very different fungi than did homes in Arizona,

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because most household fungi originate outside and come in either on people's clothes or through windows and doors.

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As for the bacteria, those were strong indicators of the identity of the home's residents.

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Much of the bacteria was shed by the human body and was a pretty good indicator of a home's gender ratio.

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The single-celled organisms also showed whether a pet shared the home, cats and dogs make their own contributions to the indoor bacterial menagerie.

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The research could inform forensic investigations and allergy studies.

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In the meantime, what can we take from these findings?

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Well, you can clean up dust but you can't change its composition.

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That is, unless you move. Or make some changes in the pets and people you live with.

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Thanks for the minute, for Scientific American 60-Second Science.I'm Erika Beras.

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This is Scientific American 60-Second Science. I'm Erika Beras. Got a minute?

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The dust that accumulates in the corners of your house does more than just cause allergies and aggravation,

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it's also teeming with clues about where you live and who you live with.

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That's the finding of a study in the Proceedings of the Royal Society B.

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Researchers had volunteers at nearly 1,200 homes across the U.S.collect indoor and outdoor dust samples.

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The average home's dust contains about 5,000 types of bacteria and 2,000 types of fungi.

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The fungi gave away a lot about a home's location.

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Different regions have different fungal populations, and thus so do houses within those regions.

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For example, dwellings around the Great Lakes had very different fungi than did homes in Arizona,

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because most household fungi originate outside and come in either on people's clothes or through windows and doors.

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As for the bacteria, those were strong indicators of the identity of the home's residents.

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Much of the bacteria was shed by the human body and was a pretty good indicator of a home's gender ratio.

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The single-celled organisms also showed whether a pet shared the home, cats and dogs make their own contributions to the indoor bacterial menagerie.

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The research could inform forensic investigations and allergy studies.

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In the meantime, what can we take from these findings?

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Well, you can clean up dust but you can't change its composition.

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That is, unless you move. Or make some changes in the pets and people you live with.

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Thanks for the minute, for Scientific American 60-Second Science.I'm Erika Beras.

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