Memes
Fragment of a discussion from User talk:Nebuchadnezzar
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I figured that being so hard to define as "individual" groups would make adding natural selection a little difficult to formalise.
But isn't a Sign something in the real world, that triggers a response, while a Meme would be what goes on in our heads, and then "kinda" (in the fuzziest possible sense) spread over a society too.