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  1. Health & Medicine

    Cheap shots — typhoid vaccine shows broad coverage

    Vaccine protects against typhoid across age groups and is especially effective in young children.

    By Nathan Seppa
  2. Space

    Evidence mounts for liquid interior of a Saturn moon

    Cassini researchers find additional support in the moon's plumes.

    By Ron Cowen
  3. Earth

    Lopsided lights

    Simultaneous snapshots reveal that northern and southern auroras aren’t always alike.

    By Sid Perkins
  4. Health & Medicine

    Chimpanzees die from primate version of HIV

    A new study links the simian immunodeficiency virus to serious AIDS-like illness in a wild population.

    By Rachel Ehrenberg
  5. Life

    Protein plays three cancer-fighting roles

    The tumor suppressor protein, p53, has three ways to protect cells from turning cancerous.