<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/560/media/images/72112000/jpg/_72112553_m1220213-coloured_sem_of_a_breast_cancer_cell-spl.jpg>
<http://www.bbc.com/news/health-25625934>