The most accepted theory now is that two to three million years ago, there was a shift in the topography in the East African Rift Valley. That those were where the first quote, homo, genus individuals arose from Australopithecines, Homo habilis, Homo erectus. And I think a very compelling hypothesis is that what happened in the time was that we began eating more meat. We know that our brains became much more powerful and large during that period as well.

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