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  1. Humans

    Letters from the June 18, 2005, issue of Science News

    Road worriers “Navigating Celestial Currents: Math leads spacecraft on joy rides through the solar system” (SN: 4/16/05, p. 250) gives the casual reader the distorted view that one could travel the solar system at will by using these methods. These are generally small perturbations on the much larger primary propulsion requirement that is fixed by […]

    By Science News
  2. Math

    Winning at Tennis

    The probability of winning a tennis set or match doesn't depend, in theory, on which player serves first.

    By Ivars Peterson
  3. Humans

    From the June 8, 1935, issue

    Ancient, titanic beasts at a museum, a test of vision theory, and ethylene gas and ripening fruit.