Uncategorized

  1. Earth

    Tracks of dust devils spotted from space

    Scientists scanning satellite images of the southern Sahara have detected trails left on the landscape by the whirlwinds commonly known as dust devils.

    By Sid Perkins

  2. Chronic vibrations constrict vessels

    Chronic vibrations of the hands can distort and twist some arterial cells to the breaking point, animal research indicates.

    By Janet Raloff

  3. Uganda shows strong gains in war on AIDS

    Uganda has shown remarkable progress against HIV, the AIDS virus.

    By Nathan Seppa
  4. Physics

    Fundamental constant didn’t vary after all

    In disagreement with prior findings, an analysis of new quasar observations indicates that alpha, the universal constant that defines the strength of the electromagnetic force, has not varied since the early days of the cosmos.