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  1. Math

    Tied Up in Knots

    Physicists have shown that tumbled strings will form surprisingly complex knots, helping explain how knots spontaneously form in nature.

    By Davide Castelvecchi
  2. Earth

    Dead Serious

    Little progress has been made this decade in reducing the size of the Gulf of Mexico's dead zone, a massive area of oxygen-depleted water caused by agricultural and urban runoff.

    By Sarah Williams

  3. 19910

    I believe that the term declination was used in error in this article. On any nautical navigation chart the difference between magnetic and true north is called “variation.” Declination has always been the angle from the horizon to a point higher into the sky. Bob NickelsonKing and Queen Court House, Va.