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  1. Health & Medicine

    Male circumcision tied to lower HIV prevalence

    Clinical programs in eastern and southern Africa also seem to be changing people’s views on the operation.

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  2. Earth

    External ills imperil tropical reserves

    Impacts just outside park boundaries cause ecosystems within to decline.

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  3. Humans

    Altruistic kidney donors help many

    Mass exchanges result in more kidneys for difficult-to-match recipients.

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  4. Earth

    Night lights may foster depression

    In animals, chronic dim light triggers brain changes that disappear with the return of nightlong darkness.

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  5. Space

    Crowd sourcing comes to astronomy

    Researchers comb the Internet for snapshots of a comet and use the collected images to calculate its orbit.