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  1. 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
  2. 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.

    By Susan Milius
  3. Chemistry

    HArF! Argon’s not so noble after all

    Researchers have for the first time coerced argon into forming a stable and neutral compound with other elements.

    By Sid Perkins
  4. Computing

    Computation Takes a Quantum Leap

    A quantum computation involving a custom-built molecule furnishes experimental evidence that a quantum computer can solve certain mathematical problems more efficiently than can a conventional computer.