<http://schema.org/description>
"On Sept. 11, 2001, terrorist attacks on America altered the world&amp;#039;s political and military landscape. How much do you really know about the history of these atrocities?"^^<http://www.w3.org/2001/XMLSchema#string>
<http://people.howstuffworks.com/september-11th-attacks-quiz15.htm>