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  1. Microbes

    Gut bacteria respect diets, not borders

    Malawian and Guahibo gut microbiomes resembled those of herbivorous mammals, while American guts were more similar to carnivores’.

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  2. Climate

    Mangroves move up Florida’s coast

    Satellite images reveal that the tropical trees are expanding north up Florida’s Atlantic coast, taking advantage of rising winter temperatures.

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  3. Astronomy

    Relic of early universe found nearby

    A galaxy little changed since the dawn of the universe shows up in our celestial neighborhood.

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  4. Animals

    Smoker’s breath saves caterpillars’ lives

    Larvae of the tobacco hornworm caterpillar exhale nicotine, driving away predatory spiders.

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  5. Health & Medicine

    Vitamin E might limit Alzheimer’s decline

    A trial of vitamin E in elderly veterans with Alzheimer’s shows promise for those in the early stages of the disease.

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  6. Plants

    Kleptoplast

    A cellular part such as a light-harvesting chloroplast that an organism takes from algae it has eaten.

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  7. Physics

    Tea time

    Leave it to the English to solve the mystery of a tea kettle’s whistle.

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  8. Tech

    Reader favorites of 2013

    For this issue, the editors selected the 25 most important and intriguing science stories of the year. But online readers seemed to point to a different bunch, showing just how subjective such an exercise can be.

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  9. Cosmology

    Best maps of the universe, bugs and all

    Maps from the European Space Agency’s Planck satellite reveal the cosmos in a range of microwave and infrared frequencies.

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  10. Animals

    Unusual new species names of 2013

    Here are five species with tongue-twister titles.

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  11. Genetics

    Top genomes of 2013

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

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  12. Astronomy

    Top exoplanet finds of 2013

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

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