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  1. Gut Check

    The normal microbial inhabitants of our intestines do a lot for their host.

    By John Travis
  2. Astronomy

    Red Team, Blue Team: Galaxy survey shows that color matters

    Using the largest survey of galaxies ever compiled, astronomers have found that the cosmos divides sharply along color lines.

    By Ron Cowen
  3. Planetary Science

    New view of Earth

    On May 8, 2003, scientists pointed a camera on board the Mars Global Surveyor probe back at Earth and captured the first image from another planet that shows our world as more than a point of light.

    By Sid Perkins

  4. Memorable Shot: Smallpox vaccine has lasting effect

    People vaccinated against smallpox decades ago may retain significant immunity to the virus that causes the disease.