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  1. Health & Medicine

    Vaccine prevents urinary-tract infections

    An experimental vaccine designed to repel 10 common bacteria that cause bladder infections has cleared a key hurdle by proving safe and effective in a group of women.

    By Nathan Seppa
  2. Astronomy

    Galaxy survey sheds light on dark matter

    Astronomers are examining some of the brightest objects in the universe to learn about the darkest stuff.

    By Ron Cowen
  3. Tech

    Magnetic refrigerator gets down and homey

    Because it uses a permanent magnet, a new, prototype magnetic cooler takes up so little space that it could give rise to ordinary household refrigerators and air conditioners that run on magnetism instead of volatile liquids.