http://www.npr.org/templates/story/story.php?storyId=128849908
"What we think is that this dietary change around 2.3 million years ago
was one of the major significant factors in the evolution of our own
species"
"That period is when cut marks on animal bones appeared -
not a predator's tooth marks, but incisions that could have been made
only by a sharp tool. That's one sign of our carnivorous conversion"
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