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  1. Dead Tired: Weary doctors function as if intoxicated

    After a month of long hours of challenging work, fatigued physicians show impairments in driving and other tasks requiring constant attention and quick reactions.

    By Ben Harder
  2. Health & Medicine

    Critical for Coating: Protein directs nerve-sheath construction

    A protein produced by nerve cells is essential for the manufacture of myelin, the fatty sheath surrounding nerve fibers.

    By Nathan Seppa
  3. Humans

    Letters from the September 10, 2005, issue of Science News

    Pennies in heaven? Why slam a copper impactor into Comet Tempel 1 (“A Grand Slam: In a winning move, NASA probe burrows into a comet,” SN: 7/9/05, p. 22)? Wouldn’t copper vapor contaminate the spray? Why not a high-temperature ceramic? P.M.