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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.

    By Aimee Cunningham
  2. Health & Medicine

    Embryos, please

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

    By Brian Vastag
  3. Health & Medicine

    Therapeutic sorghum?

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

    By Janet Raloff
  4. Physics

    Broadband vision

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