<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/560/media/images/73508000/jpg/_73508097_m5300282-aids_research_siv_infected_chimpanzee_blood-spl.jpg>
<http://www.bbc.com/news/health-26535398>