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  1. What do you see?

    Emotion may help the visual system jump the gun to predict what the brain will see.

    By Jenny Lauren Lee

  2. Pearls Unstrung

    For a while, the Great Lakes weren’t connected by rivers and Niagara Falls was just a trickle.

    By Sid Perkins
  3. Tech

    Isotope crisis threatens medical care

    Global production of the feedstock for the leading medical-imaging isotope is low and erratic, putting health care in jeopardy.

    By Janet Raloff

  4. Balancing gains and threats in cardiovascular care

    Clyde W. Yancy, a cardiologist and medical director of the Baylor Heart and Vascular Institute in Dallas, became national president of the American Heart Association on July 1.