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  1. Animals

    Butterflies’ tidy drinking tricks

    The long tube of the insects' mouthparts is fluid friendly only at the tip.

    By Susan Milius
  2. Health & Medicine

    DSM-5 enters the diagnostic fray

    Fifth edition of the widely used psychiatric manual focuses attention on how mental disorders should be defined.

    By Bruce Bower

  3. Letters to the editor

    Invertebrate enigmas I found the recent article “Evolutionary enigmas” (SN: 5/18/13, p. 20) fascinating because I know of another example of an invertebrate animal possessing a “strictly vertebrate” quality. As a high school human anatomy and physiology teacher, I sometimes have my students test the effects of the constituents in cigarette smoke on live Daphnia […]

    By Science News
  4. Health & Medicine

    Balloon Clears Arteries

    Excerpt from the June 29, 1963, issue of Science News Letter.