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  1. Health & Medicine

    Some psychoactive drugs ease harsh PMS

    Drugs such as widely prescribed Prozac can relieve a severe form of premenstrual syndrome.

    By Nathan Seppa
  2. Math

    Global contest nets encryption standard

    A data-scrambling scheme called Rijndael was selected to become the federal government's new formula for protecting sensitive, unclassified information.

    By Ivars Peterson
  3. Astronomy

    Stellar motions provide hole-y data

    Measuring for the first time the acceleration of stars near the dense core of our galaxy, astronomers have obtained more precise information on the location and density of the black hole that lurks there.

    By Ron Cowen
  4. Astronomy

    Gang of four: Debut of a big telescope

    In the desert of northern Chile, a fourth 8.2-meter