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  1. Health & Medicine

    Arteries may be vulnerable to HIV attack

    HIV may directly interact with cells in arteries, predisposing people to heart attacks.

    By John Travis
  2. Chemistry

    Feline stimulant fends off mosquitoes

    Preliminary results suggest that catnip may be more effective at repelling mosquitoes than the widely used chemical DEET.

    By Jessica Gorman
  3. 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
  4. Health & Medicine

    Immunity’s Eyes

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