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  1. Earth

    DNA pinpoints poached ivory tusks

    Scientists tracked the origin of an illegal ivory shipment to Zambia by using an improved DNA-analysis technique to study the confiscated tusks.

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  2. 19803

    To discourage poaching, authorities in Zambia should subdue every elephant they can find, sedate it, harvest the ivory themselves, and sell it for revenue for animal-protection programs. That’s better than dead. Buz CraftWills Point, Texas

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  3. Planetary Science

    A crack at life

    New images of ancient cracks on Mars suggest that liquid may have percolated through underground rock on the Red Planet, providing a possible habitat for primitive life.

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  4. Health & Medicine

    Long-Term Threat

    Survivors of a childhood cancer face a sixfold risk of developing a new cancer later in life, compared with people in the general population.