Hand-carved arrowheads and jagged spears made of obsidian, a sharp rock formed by volcanic magma, are remnants of vast ...
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College students help unearth 1,000-year-old home of elite family in Mexico. See ita variation that is more resistant than black obsidian and was used to make knives and arrowheads by the family, researchers said. They also found a nearly 5-inch fragment of a Huastec flute with ...
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