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  1. Physics

    Topsy Turvy: In neutrons and protons, quarks take wrong turns

    Revved-up particles, namely quarks, spinning inside neutrons in the opposite direction to that of the neutrons themselves, challenge the prevailing model of how quarks behave.

    By Peter Weiss
  2. Humans

    Letters

    Letters from the Jan. 3, 2004, issue of Science News.

    By Science News
  3. Planetary Science

    Journey to Mars

    The rugged Mars Exploration Rover (MER) is scheduled to land on Mars on Jan. 4, 2004. A variety of Web sites offer information about the exploration of Mars and Mars rovers. Check out the official MER Web site for background information and up-to-the-minute reports. San Francisco’s Exploratorium Web site highlights various Mars-related activities.