H. erectus cut, chewed way through evolution

Less energy needed to eat sliced raw meat led to smaller teeth, jaw

BITE CLUB  Early members of the Homo genus evolved relatively small jaws and faces because they sliced raw meat with stone tools, making it easier to chew and digest, a new study concludes (Homo erectus, represented by a 1.8-million-year-old African skull, shown).

Chip Clark, Smithsonian Human Origins Program 

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