<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://digitalspyuk.cdnds.net/12/14/bigbangtheory_stephenhawking1.jpg>
<http://www.digitalspy.com/tv/the-big-bang-theory/news/a374649/the-big-bang-theory-stephen-hawking-meets-sheldon-first-pictures/>