News

  1. Health & Medicine

    Stent Repair: Coated replacements better than radiation

    To clear clogged stents, the small mesh cylinders that doctors implant to prop open blood vessels, inserting a second, specially-coated stent works better than treatment with radiation.

    By Nathan Seppa
  2. Astronomy

    Cosmic Triumph: Satellite confirms birth theory of universe

    The most detailed portrait ever taken of the radiation left over from the Big Bang provides fresh evidence that the universe began with a tremendous growth spurt, expanding from subatomic scales to the size of a grapefruit in less than a trillionth of a second.

    By Ron Cowen
  3. Earth

    Manufacturers agree to phase out nonstick chemical

    Complying with a request from the Environmental Protection Agency, the companies that make the likely carcinogen perfluorooctanoic acid (PFOA) have agreed to phase out its release worldwide by 2015.