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  1. Earth

    Grand Canyon born by continental lift

    A "drip" deep within the Earth may have raised the Colorado plateau to create the spectacular landscape of the U.S. Southwest.

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  2. Life

    Genes & Cells

    A boost for tired antibiotics, plus a fishy mom’s mucus and high-gravity microbes in this week’s news.

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  3. Earth

    With warming, Arctic is losing ground

    Scientists anticipate big ecosystem changes as erosion spills nutrients into the sea

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  4. Space

    Former planet may have grown a tail

    Pluto appears to trail a cometlike cloud of gas.

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  5. Health & Medicine

    Body & Brain

    A genetic cause for small brains, heart links to HIV and calcium, and more in this week’s news.