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  1. Animals

    Unusual new species names of 2013

    Here are five species with tongue-twister titles.

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  2. Genetics

    Top genomes of 2013

    Scientists continue to decode the genetic blueprints of the planet’s myriad flora and fauna.

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  3. Astronomy

    Top exoplanet finds of 2013

    Here are some of the year’s most notable finds.

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  4. 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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  5. 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.