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Iron and Steel

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  1. How Iron and Steel Work (HowStuffWorks.com)
      "When you compare iron and steel with something like aluminum, you can see why it was so important historically. To refine aluminum, you must have access to huge amounts of electricity. To shape aluminum, you must either cast it or extrude it. Iron is much easier to deal with. Iron has been useful to man for thousands of years, while aluminum really did not exist in any meaningful way until the 20th century." 9-05

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