<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/560/media/images/57620000/jpg/_57620218_579172main_grail20110811-43_946-710.jpg>
<http://www.bbc.com/news/science-environment-20617506>