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  1. Tech

    Body-fluid battery

    A battery that's activated by body fluids such as saliva or urine may one day power devices ranging from disposable home health-care testing kits to emergency radio transmitters that turn on with a lick.

    By Peter Weiss
  2. Health & Medicine

    Protein fingered in rare psychosis

    A protein is pivotal in bringing on the psychotic attacks that beset people with porphyria, a rare inherited disease.

    By Nathan Seppa
  3. Health & Medicine

    When Flu Flies the Coop

    Scientists are tracking the spread of a threatening influenza virus in birds and exploring strategies that could be used to halt a potential outbreak in people before it explodes into a global epidemic.