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  1. Astronomy

    Dead stars may masquerade as ingenues

    A heavenly deception in which dead stars lie about their ages could throw into disarray theories describing some of the densest objects in the cosmos.

    By Ron Cowen
  2. Health & Medicine

    Edible vaccine spawns antibodies to virus

    Genetically engineered potatoes can deliver an edible vaccine against Norwalk virus, a common diarrhea-causing pathogen.

    By Nathan Seppa
  3. Earth

    Greenland’s ice is thinner at the margins

    The central portion of Greenland's ice sheet is, on the whole, not getting any thinner, but most margins of the ice sheet are thinning substantially and contributing to rising sea levels.

    By Sid Perkins

  4. E.