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  1. Tech

    New method lights a path for solar cells

    Using a technique in which chemical ingredients assemble themselves, a research team has developed a potentially inexpensive way of making solar cells.

    By Jessica Gorman
  2. Ecosystems

    Marine plankton put nitrogen in a fix

    New genetic analyses of tropical marine microorganisms hint that some species are converting significant amounts of atmospheric nitrogen into nutrients, helping to fortify the base of the ocean's food pyramid.

    By Sid Perkins
  3. Health & Medicine

    Antioxidants + heart drugs = bad medicine?

    Taking dietary antioxidant supplements along with certain cholesterol-regulating drugs may diminish the effectiveness of those drugs in boosting the so-called good cholesterol.

    By Janet Raloff
  4. Health & Medicine

    Insect-saliva vaccine thwarts parasite

    Mice inoculated with a component of sand fly saliva develop immunity to Leishmania, a protozoan that infects hundreds of thousands of people in the tropics each year.