Feature

  1. Paleontology

    A Makeover for an Old Friend

    Time and technology revamp a dinosaur classic.

    By Sid Perkins
  2. Astronomy

    X-Ray Visionary

    Proposed observatory would image black holes and coronas of nearby stars.

    By Ron Cowen

  3. Culture of the Sea

    Whales and dolphins strut their social stuff for scientists.

    By Bruce Bower
  4. Astronomy

    Invisible Universe

    X-ray astronomy opens a new window on the most energetic cosmic events.

    By Ron Cowen
  5. Health & Medicine

    Know Your Enemy

    Scientists mine the tuberculosis genome.

    By Damaris Christensen

  6. What’s Worth Saving?

    A fracas over a biological term could have huge consequences for conservation.

    By Susan Milius
  7. Animals

    Cetacean Seniors

    Whales that give new meaning to longevity.

    By Janet Raloff
  8. Physics

    Breaking the Law

    Can quantum mechanics + thermodynamics = perpetual motion?

    By Peter Weiss

  9. Human, Mouse, Rat . . . What’s Next?

    Scientists lobby for a chimpanzee genome project.

    By John Travis
  10. Earth

    The Making of a Grand Canyon

    Carving this beloved hole in the ground may not have been such a long-term project.

    By Sid Perkins
  11. Health & Medicine

    Male Choice

    The search for new contraceptives for men.

    By Damaris Christensen
  12. Math

    Unlocking Puzzling Polygons

    Proof settles a wickedly prickly question about unfurling crinkly polygons.

    By Ivars Peterson