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4.I just want to comment on how large and successful the cities of ancient times were.  For example, Babylon was larger than San Francisco, and Sumerian/early Mesopotamian cities were modern in all aspects except technology.  When you think “ancient” you think cavemen or savages, but the ancient people were very much just as advanced as we are now.  If they had had the same technology back then as we have now, they would probably have been almost identical to us today.

4.I just want to comment on how large and successful the cities of ancient times were.  For example, Babylon was larger than San Francisco, and Sumerian/early Mesopotamian cities were modern in all aspects except technology.  When you think “ancient” you think cavemen or savages, but the ancient people were very much just as advanced as we are now.  If they had had the same technology back then as we have now, they would probably have been almost identical to us today.