re: Mohenjo-Daro
[I think the only human communities on earth that would have a sufficient concentration of skills to survive a civilization-wide collapse would be the villages of India. The average village family still knows how to grow its own food and fiber and weave its own cloth. Wouldn't it be ironic if civilization was once again confined to the Indus River Valley?]
True, we will always be hunteres and gatheres. The days of the bows and arrows are never done.