Let me take a wild guess, the cultural thing that happened 8000 years ago was patriarchy...
(I'm not able to tell whether the research is legit so of course this interpretation has all sorts of limits.)
https://psmag.com/environment/17-to-1-reproductive-success
Un'istanza mastodon antifascista prevalentemente italofona con base a Bologna - Manifesto - Cosa non si può fare qui An antifa mostly-italian speaking mastodon istance based in Bologna - About us - What you can't do hereTech stuff provided by Collettivo Bida