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I suggest memes as in the Richard Dawkins original definition, not funny haha memes but shared reproducible culture. We are social creatures, more than any other, and our social development has happened far more quickly than typical evolution ever could.

Quite a bit of human development has been in the category of nurture, as opposed to nature. While humans have changed little biologically, I have an “appendage” in my hand that can communicate with an individual in space. Memes replicate and evolve much more quickly than genes do.