<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/560/media/images/74372000/jpg/_74372819_cancer_cell,_artwork-spl-1.jpg>
<http://www.bbc.com/news/health-28688311?postId=120092773>