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  1. Animals

    Microbe lets mite dads perform virgin birth

    A gender-bent mite—in which altered males give birth as virgins—turns out to be the first species discovered to live and reproduce with only one set of chromosomes.

    By Susan Milius
  2. Earth

    Ozone flares with fireworks festivities

    Holiday fireworks and sparklers trigger ozone-generating chemical reactions in the lower atmosphere.

    By Jessica Gorman
  3. Health & Medicine

    Critical Care: Sugar Limit Saves Lives

    Strictly controlling blood-sugar concentrations in critically ill patients can reduce deaths by a third.

    By Damaris Christensen

  4. From the June 27, 1931, issue

    LARGER MERCURY VAPOR ELECTRIC GENERATING UNIT BEING BUILT A new and larger turbine electric generator that will use mercury vapor instead of steam and will consume less fuel than corresponding modern steam plants is being constructed in the General Electric Company plant at Schenectady, N.Y.