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  1. Microbes

    Microscopic menagerie

    The microbes dwelling in and on multicellular organisms should be viewed as evolutionarily inseparable from their hosts, some biologists argue.

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  2. Humans

    Mother lode

    Certain sugar molecules in human breast milk do more to foster beneficial microbes, and banish harmful ones, than they do to nourish newborns.

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  3. Microbes

    The vast virome

    When it comes to the microbiome, bacteria get all the press. But virologists are starting to realize that their subjects also do a lot more than make people sick.

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  4. Astronomy

    Year in Review: Meteorite makes an impact

    A falling rock delivers a wake-up call.