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  1. Astronomy

    Cloudy puzzle on Uranus

    Astronomers can’t explain the seemingly ephemeral nature of bright clouds seen on the northernmost sunlit edge of Uranus.

    By Ron Cowen
  2. Physics

    Voltage flip turns magnetism on, off

    Researchers in Japan have made a material whose inherent magnetism can be turned off and on electrically, as long as the material, a novel semiconductor, stays ultracold.

    By Peter Weiss
  3. Physics

    Collider is cookin’, but is it soup?

    By making the densest, hottest matter ever in a lab, smashups between fast-moving nuclei in the Relativistic Heavy Ion Collider are coming closer than ever to reproducing the superhot, primordial fluid that presumably filled the universe immediately after the Big Bang.