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  1. Nausea drug may aid alcoholism treatment

    A drug that lowers the activity of serotonin and other chemical messengers in the brain may boost the effectiveness of psychological treatments for a severe form of alcoholism.

    By Bruce Bower
  2. Earth

    Cars’ ammonia may sabotage tailpipe gains

    Though cars' catalytic converters clean up some of the acidic contributors to urban haze and particulates pollution, a subset of these pollution-control devices seems to foster the production of ammonia, another pivotal ingredient in haze and particulates.

    By Janet Raloff
  3. Animals

    Toothy valves control crocodile hearts

    The odd cog teeth of the crocodile heart may be the first cardiac valve known to control blood flow actively.