Uncategorized

  1. Astronomy

    Galaxy’s Black Hole: X Rays Mark Spot

    An X-ray outburst from the center of our galaxy is providing compelling new evidence that a monster black hole lurks at the Milky Way's core.

    By Ron Cowen
  2. Health & Medicine

    Immunity’s Eyes

    Proteins called toll-like receptors allow human immune cells to detect microbes.

    By John Travis
  3. Earth

    Aircraft spies on health of coral reefs

    Marine ecologists report the development of a new remote-sensing system that can assess the health of coral reefs from planes.

    By Janet Raloff

  4. A tip of the tongue to the brain

    Researchers have identified several brain areas that together underlie the experience of feeling certain that a piece of forgotten information is nonetheless on the tip of one's tongue.