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  1. Earth

    Emissions tied to global warming are on the rise

    The United States emitted nearly 1 percent more greenhouse gases in 2005 than it did in the year before.

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  2. Health & Medicine

    Embryos, please

    Almost half of Spanish couples who were asked recently to donate excess embryos for stem cell research did so.

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  3. Health & Medicine

    Therapeutic sorghum?

    Sorghum's inflammation-fighting activity is comparable to that of a prescription arthritis medicine, animal research indicates.

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  4. Physics

    Broadband vision

    Cells that act like optical fibers could explain why vertebrate retinas have sharp vision despite being mounted backwards.