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  1. 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
  2. Math

    A Grove of Evolutionary Trees

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

    By Julie Rehmeyer
  3. Humans

    From the May 8, 1937, issue

    Finishing a telescope, finding new matter, and launching rockets.