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Took me a few days to find the time for that vid and it was fascinating!
10,500BC or 12,500 years ago? Is that a long time?
Mitochondrial Eve is about 200,000 years old.
http://en.wikipedia.org/wiki/Mitochondrial_Eve

Tough to know when we migrated across the world (approx 45 to 80,000 years, http://www.smithsonianmag.com/history-archaeology/human-migration.html?c=y&page=2)

Add to that the population needed to support such great builds.................

Actually, I can believe we could have done it.
The longevity of a live could have made the difference.
125 year life time might have been possible.