Uncategorized

  1. Earth

    Finding fault for an old earthquake

    Scientists in Southern California believe they've found evidence that finally identifies the source of one of the region's largest quakes, a magnitude 7-plus temblor that struck the area on Dec. 21, 1812.

    By Sid Perkins
  2. Earth

    Satellites could help track sea level

    Experiments that used signals from Global Positioning System satellites to precisely measure altitude above a lake's surface may pave the way for fleets of spaceborne sensors that can quickly and inexpensively monitor local and global changes in sea level.

    By Sid Perkins
  3. Health & Medicine

    Rwandan patients show unusual HIV

    Blood tests on people in Rwanda who have had HIV infections for years without symptoms of AIDS indicate that the viruses in these patients have rare mutations.