[LouieFisk]

Interesting stuff, thanks
I think catastrophic events may have shaped the world at times.
You may have already seen this, I imagine.
“Secrets of the Dead - Catastrophe!” (Part One)
https://www.youtube.com/watch?v=XpmauuMrQQU

[ckilmer]

What has usually wiped out civilizations over the last 5000 years has been doubt.