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  1. 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
  2. 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
  3. 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.

    By Ivars Peterson
  4. Humans

    From the April 22, 1933, issue

    SPARKING PROCESS STUDIED WITH LICHTENBERG FIGURES What is an electric spark made of, is the question partly answered by the brilliant whirligig figure on the front cover of this weeks Science News Letter.