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

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This year, the number of mobile phones on cell networks is expected to surpass the Earth's population.

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"More people now own cell phones than actually have access to working toilets."

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James Meadow, a microbial ecologist at the University of Oregon.

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Hidden in the data is the reality that some people work on their phones¡ on toilets.

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If that grosses you out, consider this:

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"So it turns out we're just really leaky animals.

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We just, we leave our bacteria everywhere we go."

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Including, of course, our phones.

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Meadow and his colleagues took a census of the bacteria on thumbs and index fingers of 17 volunteers, and on their smartphone touch screens.

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Overall, they ID'ed over 7,000 types.

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Looking at just the most common bacteria, those that appear more than 0.1 percent of the time,

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they found an 82 percent similarity between the microbiomes of fingers and phones.

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Meaning our phones are a pretty good mirror of ourselves, microbially, at least.

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The results appear in the journal PeerJ.

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"We have always been covered in bacteria¡ and we will always be covered in bacteria."

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So the fact that our phones are also covered in bacteria is no reason for concern.

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In fact, the researchers say that mobile phones may hold untapped potential as personal microbiome sensors.

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App developers, take note.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.

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