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  1. 19403

    In this article, the photo comparison of the dam site is deceptive because the two photos of the same spot appear to have been taken during different seasons. Hence, the lower photo shows a scene that appears excessively desolate, but not because of the loss of the dam. Michael C. ReedKalamazoo, Mich.

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  2. Earth

    Tales of the Undammed

    Although destroying dams is often presumed to restore rivers, the results of such action are actually mixed, according to recent studies.

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  3. Quite a Switch

    Cells use ribonucleic acids that bind to small molecules such as vitamins to control gene activity.

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  4. Humans

    From the March 31, 1934, issue

    A desert earthquake, producing bromine from seawater, and nerve damage from alcohol consumption.