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      Knowledge is Power

      Scientific American May 1999

      WINK OF AN EYE

      Half-asleep ducks can control which hemisphere gets to snooze

      • By Jessa Netting on May 1, 1999

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      More in the May 1999 issue of Scientific American
      • Micromicrophones
      • Galileo's Cicada
      • The Editors Recommend
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