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  1. Health & Medicine

    Human-cloning claim creates controversy

    A biotech company has begun cloning human embryos.

    By John Travis
  2. Astronomy

    Craft Probes Alien Planet’s Atmosphere

    Astronomers have for the first time detected the atmosphere of a planet that lies well beyond the solar system.

    By Ron Cowen
  3. Health & Medicine

    Kawasaki patients show coronary calcium

    The heart attack risk associated with Kawasaki disease, a childhood inflammatory disease that can cause aneurysms, may stem from calcium build-up in coronary arteries.

    By Nathan Seppa
  4. Health & Medicine

    Light blow to chest can be fatal

    A light blow to the heart can cause cardiac arrest, even when the blow isn't hard enough to cause injury.