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  1. Math

    Miles from Nowhere

    Scientists have developed a new technique for calculating the ecological value of road-free areas of land and representing them geometrically.

    By Julie Rehmeyer
  2. Humans

    Letters from the May 19, 2007, issue of Science News

    Merry go round When considering a spin rate of 1,122 revolutions per second, has anyone determined the diameter of the neutron star XTE J1739-285 (“Dance of the dead,” SN: 3/17/07, p. 173)? If, for example, it were the same diameter as Earth, it would be traveling far in excess of the speed of light at […]

    By Science News
  3. Math

    A Grove of Evolutionary Trees

    "Trees of life" show patterns of evolutionary descent, and they fit together mathematically to form an abstract forest.