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  1. Questions on the Couch

    A new policy statement on evidence-based practice from the American Psychological Association illustrates the intense struggle among researchers and clinicians over how best to study the effectiveness of psychotherapy in its many forms.

    By Bruce Bower
  2. Math

    Pushing the Limit

    Scientists are moving closer to constructing superefficient, noisefree data-transmission codes.

    By Erica Klarreich
  3. Math

    Ask-a-Friend Marketplaces

    If you ask enough friends, paying for answers to questions can help you get the answers you need from a social network.

    By Ivars Peterson
  4. Humans

    From the October 26, 1935, issue

    Electric light without wires, lab-grown flu virus, and superhard glass.