<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/560/media/images/50288000/jpg/_50288098_m1321011-leukaemia_blood_cells,_light_micrograph-spl-1.jpg>
<http://www.bbc.com/news/health-11909680>