Post-Singularity Worldbuilding Quirks?
If you take it as given that...
... then what random background details might result that are both...
The reason I ask: I'm writing a story in such a setting, and am hoping to tap into the local hivemind to, possibly, help flesh out some of the background sections - ones not directly relevant to the plot, but which imply a greater depth of worldbuilding - that I wouldn't have thought of on my own. As possible examples: particular species that a weakly superintelligent post-human AI might have decided to wipe out, such as cruciferous vegetables; new species that similar WSPHAIs might have decided to let loose, such as snake varieties with interesting chemicals to be milked of their venom, or a de novo species resembling sparrow-mouse griffons; cultural quirks in one relatively isolated area or another, such as a seemingly ordinary group decision that masks are terribly comfortable to wear; odd aspects of language development after a few decades...
What comes to your mind?
Non-Linnaean wildlife. Built de novo by the superintelligence; made of the same sorts of organic materials as normal species, but not related to them; possibly not nucleic-acid based/non-reproductive. Their inner workings are simpler and more efficient; no symbiotic mitochondria and chloroplasts, but rather purpose-built modules. They are edible, and the survivors know the unique taste of, e.g., their 'muscle' tissue, which is not actin/myosin based.
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