Check out this article on Damascus steel. Think of the work it took to come up with this process all those centuries ago - pretty impressive.
http://www.nytimes.com/2006/11/28/science/28observ.html?ex=1165381200&en=993ac70d8365eff4&ei=5070&emc=eta1
or
http://www.jarodkearney.com/id18.html
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