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  1. Chemistry

    Waistline Worry: Common chemicals might boost obesity

    A family of chemicals implicated in testosterone declines may also be contributing to recent spikes in obesity and diabetes.

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  2. Earth

    Young and Restless: Ancient Earth shows moving crust

    The oldest rocks in the world show that Earth's shifting crust began its tectonic movements almost 4 billion years ago.

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  3. Gene predicts sleepy performance

    Variants in a circadian-rhythm gene predict how well people perform mental tasks when sleep deprived.

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  4. Earth

    World’s climate map gets an update

    A century-old system of categorizing the world's climates has been updated to include modern weather data, thereby providing researchers with a tool to better verify results of their computer simulations.