<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/560/media/images/57590000/jpg/_57590005_c0102712-alzheimer_s_disease_test-spl.jpg>
<http://www.bbc.co.uk/news/health-16344228>