<http://schema.org/description>
"The Mesopotamians are said to have given the world irrigation, writing, organized religion, laws and the concept of time. Why were they so advanced? What makes Mesopotamia the cradle of civilization?"^^<http://www.w3.org/2001/XMLSchema#string>
<http://history.howstuffworks.com/history-vs-myth/mesopotamia-cradle-of-civilization1.htm>