<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/560/media/images/70252000/jpg/_70252802_p4200326-front_view_of_human_eye-spl.jpg>
<http://www.bbc.com/news/health-24357476>