<http://schema.org/about>
"\nImage Credit Per Square Mile\n@stevemouzon tweets about Per Square Mile, which graphically demonstrates how much space all the people in the world would take up if they were packed as tightly as they are in Paris (three states) to Houston (well over half"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/clean-technology/if-the-worlds-population-lived-in-one-city.html>