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What's in a Word?
Cultural evolution in our species and only in our species designed thinking tools that now impose novel structures on our brains. Evolved virtual machines that then run on the basic underlying wetware of our neurons and glial cells. In humans, cultural memes can travel horizontally across generations very easily. You can share a meme to your parents. This actually gets into an interesting part where he's talking about complexity and evolution and well-o. It is meaningful to speak about trajectories, given that biological evolution is a non-guided process.