Saw this recently (though it’s a year old) that argues “junk” dna is why species can’t cross-breed
Makes me think about cultural dna… the vast number of defaults that are neither necessary nor bad, but just wildly varied and prevent cultures from mixing
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Reading amazon.com/gp/product/B08 right now — it discusses how cities were a religious innovation because before that, religion was family-only so families couldn't mix so for a city to form, they had to figure out a way to create a city-wide religion that was layered on top
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