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  1. Our Microbes, Ourselves

    Trillions of microbes live in the human gut and skin, and they may be essential to health.

    By Alexandra Goho
  2. 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
  3. 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
  4. Math

    A Grove of Evolutionary Trees

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