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Scientists Find Bacteria Where It Isn’t Supposed to Be: The Brain

Not So Clean Mind

How are dirt molecules getting into white matter—and what are they doing up there? By Amanda Schaffer.

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Sciepro/Science Photo Library, via Corbis

As anyone who’s seen a yogurt commercial knows, our guts are teeming with bacteria. So, too, are our hands, feet, ears, and mouths.

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But our brains?

Until recently, scientists would have said no way.

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