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  1. Earth

    Grand Canyon fish seem to be rebounding

    The population of humpback chub, an endangered fish found only in the Colorado River and its tributaries, may be stabilizing in some sections of the Grand Canyon.

    By Sid Perkins
  2. Animals

    Seabirds take record summer vacations

    Sooty shearwaters that breed in New Zealand have set a new record for off-season travel, covering 64,000 kilometers between visits to their mating ground.

    By Susan Milius
  3. Tech

    Nanotubes signal when engine oil needs changing

    A new, easy-to-fabricate sensor made from carbon nanotubes detects when automobile-engine oil needs replacement.

    By Peter Weiss
  4. Tech

    Hydrogen hopes in carbon shells

    Lithium atoms added to buckyball surfaces bestow on these molecules a remarkable capacity to store hydrogen.