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Aztec written language; early hominids as hypercarnivores; cave artists risked hypoxia; no evidence of Cahokia deforestation

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Hieroglyphic texts reveal the sophistication of Aztec written language  

Multiple lines of evidence suggest early hominids were hypercarnivores

Cave artists may have risked hypoxia while creating their art deep underground

Study finds no evidence to support claims of deforestation at Cahokia