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  1. Health & Medicine

    Vampire spit gives strokes a licking

    A drug derived from a component of vampire bat saliva can clear blood clots in the brains of people who have had strokes.

    By Nathan Seppa

  2. Lefties, righties take neural sides in perceiving parts

    A brain-imaging study indicates that right-handers and left-handers use different, corresponding neural regions to perceive parts of an object while ignoring the larger entity.

    By Bruce Bower

  3. 19517

    This article overlooks an immeasurable long-term cost of whole-body computed tomography scans: the potential cancers induced by high-dose radiation. Aggressive marketing of CT scans without full disclosure of the risk is unethical and should be illegal. Nancy EvansSan Francisco, Calif.