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What's just as interesting is the disparity that we see in humans with the same biological potential. How far do we have to go back in our own ancestry until ratcheting is unlikely? And why did some parts of the world like Europe and the Middle East see a technological and cultural explosion whereas others like Aboriginals of Australia didn't? If it's just environmental, then how long did humans possess the potential before the environment gave them the kick they needed? I have a feeling that epigenetics might be involved. The potential to ratchet might ebb and flow as stressors rise and fall.