

That’s such a cool setting for SciFi! Discovery of an alien civ by studying UFOs. Astonishment at discovering multiple civs. Finding out the reason why these civs don’t exist anymore. Protecting ourselves against this threat.
I wish I had time to explore this :(

Naah I don’t buy it. Individual cities and countries collapse, but not anything larger. Also, poor sanitation throughout history was mostly because of a lack of understanding of germ theory.
Nawww, I was thinking more of a secret nihilistic text or something. Something that just makes an entire civ kill themselves or something. Or maybe some equation that spells eternal doom or something that leaves everyone absolutely hopeless.
I’ll try going through the summaries of the books you recommended! Thanks :)