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  1. Chemistry

    Ancient bond holds life together, literally

    The chemical link between sulfur and nitrogen in animal tissues and organs may have sparked the assembly of single cells into complex animals.

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  2. Health & Medicine

    Dog dust may benefit infant immune systems

    Microbes from pet-owning houses protected mice against allergy, infection.

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  3. Archaeology

    Easter Island’s farmers cultivated social resilience, not collapse

    A Polynesian society often presumed to have self-destructed shows signs of having carried on instead.

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  4. Neuroscience

    The Aesthetic Brain

    How We Evolved to Desire Beauty and Enjoy Art by Anjan Chatterjee.

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  5. Science & Society

    Top 25 stories of 2013, from microbes to meteorites

    This year, careful readers may have noticed a steady accumulation of revelations about the bacterial communities that call the human body home.