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  1. On the Fringe

    Astronomers look to the Kuiper belt  for clues to the solar system’s history.

    By Ron Cowen

  2. Evolution’s Bad Girl

    Ardi shakes up the fossil record.

    By Bruce Bower

  3. The Ties That Bind

    Studies of human social networks go high-tech.

    By Lisa Grossman
  4. Life

    Cancer plaguing Tasmanian devils began in one animal’s nerve cells

    Genetics provide a starting point for diagnosis and potential vaccines.

    By Tina Hesman Saey

  5. Science Past from the issue of January 16, 1960

    MEN TO MARS POSSIBLE IN 60’S, EXPERTS SAY — The United States will be able to send three men on a 14-month expedition to Mars in a nuclear-powered two-stage rocket ship during the 1960’s, three space experts assert.