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  1. Health & Medicine

    Immune protein may stall HIV

    People who have HIV but don't progress to AIDS make extra perforin, a protein that helps kill infected cells.

    By Nathan Seppa
  2. Planetary Science

    Europa’s freckles

    Reddish spots and shallow pits that pepper the surface of Jupiter's moon Europa may mark regions where warmer and less dense ice percolates to the surface.

    By Ron Cowen
  3. Planetary Science

    Another moon for Uranus

    Astronomers have confirmed the existence of the 21st moon known to be orbiting Uranus.

    By Ron Cowen
  4. Health & Medicine

    Duct tape sticks it to warts

    Treating a wart with a covering of duct tape seems to be more effective—and less painful—than removing the wart by freezing it with liquid nitrogen.