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  1. Earth

    Livestock manure stinks for infant health

    Megafarm production associated with infant illness and death rates.

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  2. Life

    For worms, one gene can change survival behavior

    Natural differences in a single gene cause worms to either eat or avoid harmful bacteria.

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  3. Space

    Whiff of Martian methane offers lively possibilities

    The definitive discovery in Mars’ atmosphere of methane — often, but not always, a compound hinting at life — introduces the possibility of underground organisms.

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  4. Life

    Capuchin monkeys choose the right tool for the nut

    New field experiments indicate that wild capuchin monkeys choose the most effective stones for cracking nuts, suggesting deep evolutionary roots for the use of stone tools.