Bro, this dude in the jungle with his stick is fake.
Je m'appelle Claude
I'm not saying it was aliens, but there isn't any proof it wasn't aliens.
No, it was even OLDER civilizations that fell apart due to natural disasters or their own mistakes - usually both. Science is continually pushing back the date for when civilization began and as more discoveries are made this is only going to continue. Its a pretty safe bet that the first cities were founded before the last ice age.
The secret ingredient is slave
They didn't have social media back then, so a lot of free time and some religious incentive was enough
To be honest some of the shit is really compelling..