It is the first conclusive evidence of use of stone implements in human sacrifice. Experts in Mexico have found blood cells and fragments of muscle, tendon, skin and hair on 2,000-year-old stone ...
MEXICO CITY – Traces of blood and fragments of muscle, tendon, skin and hair found on 2,000-year-old stone knives have given researchers the first conclusive evidence that the obsidian blades were ...
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