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  1. Gypsy Secret: Children of sea see clearly underwater

    Children who regularly dive to collect food have better-than-normal underwater vision because their eyes adapt to the liquid environment.

    By John Travis
  2. Tech

    Columbia Disaster Working Hypothesis: Wing hit by debris

    The independent board investigating the breakup of the space shuttle presented its first detailed account of what might have caused the Feb. 1 disaster.

    By Ron Cowen

  3. 19322

    Your article neglects the most difficult problem associated with sending a probe to the vicinity of Earth’s core: sending the information back. Even a few feet of earth will stop conventional radio waves. Extra-low-frequency transmissions would do the job, but a transmission could take years.