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  1. Health & Medicine

    Delivering a knockout

    Scientists have finally succeeded in genetically engineering rats.

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  2. Haiti quake reveals previously unknown fault

    Scientists say the risk of future temblors in region is unclear.

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  3. Life

    How salmonella helps kill cancer cells

    A bacterial foe gives the immune system a boost to seek and destroy melanoma. The findings may point to a vaccine for melanoma and other malignancies.

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  4. Archaeology

    Lucy’s kind used stone tools to butcher animals

    Animal bones found in East Africa show the oldest signs of stone-tool use and meat eating by hominids.

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  5. Chemistry

    Superconductors go fractal

    Oxygen atoms arrange themselves in a self-similar pattern to help conduct electricity without resistance.