Watch Cities Spread Across The Planet Over 5,000 Years
A group of researchers combed through 10,000 data entries to create the first mappable record of human population changes, dating back to 3,700 B.C.
▻http://www.huffingtonpost.com/entry/history-of-cities-urbanization-map_us_576433f3e4b0fbbc8bea3eda?
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