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      Knowledge is Power

      Scientific American October 1990

      An Extraterrestrial Impact

      Accumulating evidence suggests an asteroid or comet caused the Cretaceous extinction

      • By Frank Asaro, Walter Alvarez on October 1, 1990

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      More in the October 1990 issue of Scientific American
      • 50 and 100 Years Ago: October 1990
      • A Volcanic Eruption
      • Books, October 1990
      View Full Contents
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