<http://schema.org/description>
"On Sept. 14, 2011, NASA announced plans for the Space Launch System (SLS), the driving force behind the American space program for the foreseeable future. How much do you know about the future of American spaceflight?"^^<http://www.w3.org/2001/XMLSchema#string>
<http://science.howstuffworks.com/space-launch-system-quiz15.htm>