<http://schema.org/about>
"We've known now for a long time that humanity's earliest roots could be traced back to Africa. Indeed, it is thought that around 70,000 years ago early human populations first began to expand and leave the African continent to spread out across the"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/clean-technology/climate-change-in-africa-may-have-driven-early-human-evolution.html>