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Obsidian, forged in magma, can produce some of the sharpened blades on Earth.
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Jet-black volcanic glass can be extremely fragile and dangerous.
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It was not discovered by humans until the Stone Age... or so we thought.
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A team of researchers reported on the latest discoveries from Melka Kunture's archaeological site in Ethiopia.
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They described the discovery and construction of an obsidian handaxe workshop under a sedimentary layer that dates back to 1.2 million years.
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This is a remarkable example of obsidian shaping and the only handaxe factory dated to the Early Pleistocene, according to the study authors.
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