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  1. Humans

    Letters from the July 2, 2005, issue of Science News

    Chlorine’s fate? “Special Treatment: Tiny technology tackles mega messes” (SN: 4/23/05, p. 266), on the reaction of nanoparticles of iron with trichloroethane (TCE) contaminating an aquifer, states that the TCE is converted “into ethane.” What happens to the chlorine stripped off the TCE? Is it converted into insoluble inorganic compounds or is it available to […]

    By Science News
  2. Math

    Magic Squares of Squares

    Squared integers can be put into magic patterns.

    By Ivars Peterson
  3. Humans

    From the June 22, 1935, issue

    Beauty in a police radio transmitter, a new aid in controlling diabetes, and mathematical help for cake bakers.