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  1. Life

    Portuguese trove of trilobite fossils

    Fossils include largest known trilobite specimen and groups of the ancient arthropods caught in the act of molting and spawning.

    By Sid Perkins
  2. Health & Medicine

    Keeping artery plaques under control

    Toning down a gene called CHOP may offer a way to reduce the risk of arterial plaque ruptures, which can cause heart attacks and strokes, a study in mice shows.

    By Nathan Seppa
  3. Health & Medicine

    Narcolepsy linked to immune system

    Genome association study finds a second connection between the sleep disorder and the body's disease-fighting apparatus

    By Tina Hesman Saey
  4. Space

    Origin of high-energy cosmic rays more mysterious, again

    The origin of the rare, energetic particles that previous evidence indicated came from galaxies that house supermassive black holes, is now much less certain.