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      Engines: The Inner Workings of Machines That Move the World by Gray, Theodore
      Engines: The Inner Workings of Machines That Move the World -- Theodore Gray - Hardcover
      $32.00 $22.98
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      Thing Explainer: Complicated Stuff in Simple Words by Munroe, Randall
      Thing Explainer: Complicated Stuff in Simple Words -- Randall Munroe - Hardcover
      $26.99 $18.98