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      Knowledge is Power

      Scientific American April 1998

      The Timekeeping ELF

      The fleeting second paces the most intimate of human rhythms, the quick heartbeat.

      • By Philip Morrison on April 1, 1998

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      More in the April 1998 issue of Scientific American
      • Laser Scissors and Tweezers
      • Cosmic Antimatter
      • In Brief, April 1998
      View Full Contents
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