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