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  1. Earth

    What Goes Up

    A massive scientific field study in Mexico City, along with lab experiments and computer simulations, show that pollution from the world's megacities has a global impact.

    By Sid Perkins

  2. Bipolar Express: Mental ailment expands rapidly among youth

    Diagnosis of bipolar disorder in kids and teenagers has dramatically increased since 1994, raising concerns that this severe mood disorder is being overdiagnosed.

    By Bruce Bower

  3. 19878

    Two recent articles hit on the same theme. This one discussed the recent sharp increase in the diagnosis of bipolar disorder. The summary of the new book Shyness: How Normal Behavior Became a Sickness (SN: 11/17/07, p. 319) hit much closer to the mark.