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  1. Tech

    DNA embrace might drive micromachines

    DNA interactions that bend tiny diving boards, or cantilevers, may open the door to powering micromachines by means of molecular reactions.

    By Peter Weiss
  2. Ecosystems

    New protection for much-dogged shark

    To rebuild northeastern U.S. populations of the spiny dogfish, the first fishing quotas on this species limit the harvest to roughly 10 percent of the 1998 haul.

    By Janet Raloff
  3. Health & Medicine

    Lingering legacy of Sept. 11, 2001, on firefighters’ health

    Of the New York firefighters involved in the rescue and recovery effort after last year's terrorist attacks, relatively few have developed chronic coughs and respiratory problems, but among those who did, the problems seem unusually severe.