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</html><description>History of Crystals The first known use of crystals by human beings dates back to the Stone Age, when man first used flint for tools and weapons. Many centuries later the Mayans valued Obsidian for its ability to produce a sharp edge or point for spears and knives, and also to form magical mirrors which [&hellip;]</description><thumbnail_url>http://www.onlinehomestudies.com/blog/wp-content/uploads/2010/03/crystal-grid-350x262.jpg</thumbnail_url></oembed>
