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  • The many artifacts they???ve dug up include 14 fragments of obsidian, a volcanic rock used to make arrowheads and other tools. ???When it is made into a blade, that edge is so sharp; it can be even sharper than surgical steel,??? says Dr. Susan Ryan, the archaeologist who leads the expedition. ???It???s the type of material that you would prize, that you would want to keep around for a long time i
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