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  1. Health & Medicine

    Nerves are key to longevity effect

    The life-extending effect that some animals get from calorie-restricted diets may depend on signals from the brain.

    By Patrick Barry
  2. Earth

    Double-acting bacteria immobilize toxic nanoparticles

    Bacteria lurking in the bowels of an abandoned Wisconsin mine might help remove toxic metals from polluted water.

    By Sarah Webb
  3. Animals

    West Nile virus hits bird populations

    West Nile virus has hammered populations of five common North American birds.

    By Susan Milius
  4. Planetary Science

    Eris dwarfs Pluto

    Ex-planet Pluto suffers another demotion, as observations show that it's much less massive than Eris, another distant denizen of the outer solar system.