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  1. Health & Medicine

    Where funny faces come from

    Making a face might have helped human ancestors survive.

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  2. Health & Medicine

    Girl athletes’ energy crisis

    Lack of regular periods in teenage female athletes stems from a hormone imbalance arising from inadequate energy intake.

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  3. Animals

    Squeaky chimp sex, or not

    Female chimps tend toward silent sex when the other girls could overhear.

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  4. Space

    Rocky cores form first

    A theorist says new extrasolar findings prove that the standard model of planet formation is correct.

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  5. Health & Medicine

    Cooking cancer cells

    A new technique combining antibodies, carbon nanotubes and near-infrared light holds promise for treating malignancies, scientists report.